Top 5 Boxster 986 performance mods
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- Опубликовано: 27 июл 2024
- This time on Road and Race we look into increasing horsepower by fitting performance mods.
As you all know by now I own a 986 Boxster S. On this episode I wanted to look into the options you have when trying to increase the horsepower of the engine. Although these will be specific example for the Boxster the principles can be applied to any combustion engine car.
1.987 Airbox and intake
2. Underdrive pulley
3. Larger 996 throttle body and plenum
4. Performance sports exhaust.
5. ECU remap
road-and-race.co.uk/tools 
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I have a 1999 Boxster 986 and have done the following performance mods (after L&N IMS was done) 1. K&N high performance air filter 2. FVD performance software 3. Fabspeed sport headers 4. Fabspeed MaxFlo Exhaust 5. 74mm 996 throttle body 6. IPD Plenum (have to use 996 larger throttle body to fit) 6. TRS underdrive pulley 7. 997 ignition coils car runs, drives, and sounds awesome Although my advice would be to start with a Boxster S, that way you start with a little more HP then the base Boxster
Wow! Looks like you've done everything! Have you been on a rolling road to see how much more power you have?
Hi Jeff, was this a 2.7L? cheers
All that without a rolling road after 🤦🏻♂️
what´s this black magic you call performance software? Is your engine turbo or atmosferic?
Without the ECU remap, the first three mods (Airbox/Underpully/Throttle Body and Plenum) won't come close to providing the gains suggested here, sadly. You need to reprogram the ECU so it can make the most from those first three changes and new found flow, otherwise the engine is just going to pull what it was programmed to do from the factory and you won't see any gains.
dont think you can reprogram atmosferic engine cars. or it makes things break if you do, you have to upgrade stuff to make things easyer/smoother so your limited hp is better used.
This is some amazing research! Very well put together, makes it easy to understand, I am looking forward for some of these mods being done to your car :) cheerS!
+ltz15 Thanks mate, really nice to get some positive feedback.
Great vid, very informative! I like the cost per BHP well edited, keep going and you'll get loads more subs!
+Blair Thanks for the kind words Blair
This is one of the best videos on real-world Boxster performance I have seen
Surprised it doesn't have more views
+Alberto Laita Many thanks Alberto. Makes me happy to hear that!
Really good, real world information explained incredibly well. Cheers
+Paul Davis Such great feedback - Thanks so much Paul
By the numbers, appreciate the info. Good Job!
Thnx for the knowledge bruh, i hate when people say '' buy another car, engine or shoot it with nitrous''. Missing the whole point of the video, this is WHAT I BOUGHT AND HAPPY WITH IT OR DIDN'T HAVE MORE MONEY TO BUY A PORSCHE GT2RS ! AND ALL I WANT IS TO GET SOME TIPS HOW TO MAKE IT SLIGHTLY FASTER WITHOUT HAVING TO DONATE MY KIDNEY AND DON'T NEED 10.000 HP TO BE HAPPY. Now that beeing sayd i know tha car is underpowered and limited but i love it. It is and will always be a porsche! Thnx once more for the video.
Nicely done mate
Thanks 👍
Man your videos are great!
Love a video with a 200/1 like dislike ratio!
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@Jeremiah Deangelo Instablaster :)
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Hi! You listed throttle body and plenum to only cost 160£. Where do you find them that cheap because everywhere where I have looked they have costed something like 1000£? Can you link me those. Thank you
Hi, congratulations on buying your Porsche, they really are an awesome vehicle. Great video, I'm just a bit confused about the under pulley and how it turns slower?
Subscribed and liked. Cheers
+Brett Fitton Cheers for the sub and like Brett! The underdrive pulley had a smaller diameter thus the effective speed at its edge will be less. If you're interested I've done a 3 part Power Mods series where we do all these changes.
I'd do the lost other than the underdrive pulley, always been weary of those.
Very useful video , you really deserve to be followed , Like + Subscribe + Favorite , and thanks to share your knowledge .
+xXxBeRightBackxXx Thank-you for the kind words.
I found your channel today and I saw the video where you talked about this topic. I'm glad I didn't type a long comment, lol. Anyway, I think the smartest thing to do would be to buy used parts from "bigger brothers". Of course, only the ones that fit. I think that would be much better than buying no name tunig parts. Probably even cheaper. ECU remaping is the last step since it wouldn't make any sense otherwise. Am I right?
+West Senkovec Yeah, you're correct, ECU mapping last
Not worth trying to add power to an old boxy. If you want to go faster in the old barge, it's much better value to give it a decent suspension. Combine that with a set of lower than standard profile tyres, and you get a much better handling. You can brake later and harder into corners, which will give you a higher average speed. A 986 on stock suspension can't really convert added power into higher speed. Well, it can....if you only ever drive in a straight line.
Also, remember most of the mods you are suggesting in fact will reduce engine power, unless you send your car in for a Dyno run with a remapping. And I'll say most owners of old 986 really won't want to risk engine damage during a full power Dyno run. Any component failure on the dyno will cost more to repair than the car is worth.
Very nice
Thanks!
All good sharing and thank you. I do have a couple of questions; are these mods legal in California, USA. and will I be able to pass my smog test.
Thanks Ricardo! Sorry, but I live in the UK so don't know about Califonia's legislation. Maybe someone else can help in the comments?
The modifications that are legal in California are.... live on the street, have an electric car and fly on your private jet
Great Vids! Enjoy watching them and look forward to the next!
+Engleburt Thanks, it makes my day when I get a comment like yours. Let me know if there's anything in particular you'd like to see.
Not sure where you found a ECU tune for that low but in the states its about 1k$
£550 is currently $700 USD and that amount fluctuates. Perhaps it was $1,000 when the video came out.
@@lifehackertips It actually has gone up for the Porsche here in the states. Be lucky to see a 700$ price for tune
Just buy a 987 save the bother, also letting in more air has its problems to as the maf will simply shut the air down when the ecu gets the message there is to much air, the ecu needs told this is happening or it may even slow the car down
Hello. Could u help with a 2.5 1998. Looking to buy. Can u put nav in it?
with a aftermarket stereo, yes
NO2 will really lite up the HP.
CAN I USE AN LNG SYSTEM AT BOXTER?
Uhh... what about boring out the 986 engine to 996 specs?
Would you recommend the Boxster as a first car?
+Unethical Rager A first car? Such as when you've just passed your driving test? If so it's a bit powerful for a novice driver. Also it's rear wheel drive which can catch some new drivers out.
No, but only because of the cost of maintenance, since Porsches require frequent maintenance and it is very expensive compared to other manufactures. A toyota camry or corolla would be a better first car, and when that is paid of, then get a Boxster as a second car, keeping the camry or corolla as a backup for when the Boxster requires maintanence. When I last brought my Porsche to Porsche, they said it would be $15,000 for all scheduled maintenance to be done. $15,000 is more than an entire lifetime of maintenance for a corolla or camry.
How fast can you make it go?
I’ve 3 more videos on this where we try out all the mods.
What about the Plenum Y / V air splitter mod?
Great video btw...
Was that sarcasm when u were saying that it should be easy to take off the belly and use a dremel on a boxster engine, lol I'm sure u were, I've owned my boxster for almost 6 months and have never seen the engine 😅
6 BHP from a £550 remap?! That's got to be a typo surely?
It's just a conservative estimate. There's not much you can do with a naurally aspirated engine. Wasn't able to test it in real life though. Have you seen my series on modifying the boxster for more power?
it's probably correct, a NA engine can only do so much. Perhaps with all the other mods done first the remap might be more benefiical, but on a stock engine the remap would only be a few BHP
Please do these mods
Your wish is my command: ruclips.net/video/kja5LSsUT_g/видео.html
Road and Race lol your the man!
Thanks mate, let me know what you think of the mods! It's a total of four parts.
Road and Race there all good mods but it was running rich after the mods, did he get the remap to rectify this and so did it fix the torque drop at 3000 revs and still maintain the extra power at top end ?
You should do each one and dyno test the car before and after each time to see the real increase
Sorry mate are you in London?
Used to but now live in Peterborough. Why you ask?
I needed someone who is an expert like yourself. I get so lost with who to trust in terms of knowledge. do you mind if I get your number for guidance. email me if possible. would help lots mbh.taimuri@gmail.com
Yes these mods can increase power and it's not rocket science. the lighter the rotating assembly (pistons,crank,con rods,flywheel, valves) the more power you can make without adding forced induction to the mix. also,the better the air flow in(Oxygen) and out (CO2) of the engine,the more power you'll be able to obtain.
Sorry if I came off rude before but I'm just simply stating the facts. what if someone who knows nothing about cars watched this video and repeated what you said to someone else who is more familiar with the physics behind engines,the person who repeated what you said would become embarrassed and he/she would probably be laughing stock
Lighter internals do not increase power. They are just lighter and the engine will be able to accelerate faster. No more power being created by the engine.
+sje106 they do increase both power and throttle response. Ever heard of parasitic loss and rotational inertia
The rotational inertia of the rotating assembly reduces power and fuel economy since it requires more force to move heavier objects than lighter objects. the same principle apply here. do your research and don't embarrass yourself.
6bhp for re map lolz? wtf.
Yeah no turbo is hard to tune
Using a larger throtle body with the same engine (unless you force induction) will not increase engine performance.
We tested this in real life and it did. Check out my three Boxster performance mods videos.
has anyone dyno'd to back up these claims? prestige car groups are full of ridiculous unbacked claim and people that throw money and insist it works with no evidence.
The under drive pulley does not spin slower than the stock crank pulley,it actually spins faster. It is lighter and has a smaller radius than the stock and as a result, it will rotate faster because it has less rotational inertia than stock and the smaller radius allows it to spin faster hence less power is taken from the crankshaft to drive the pulley which results in the power increase. I agree that we all make mistakes but dude,get your facts right before you make videos and misinform people who aren't engineers and want to know the actual logics behind the power gain.
If it spun slower,that means that there's more rotational stress on the crankshaft, restricting the crankshaft rotation and as a result there would be a reduction in power and you would have a very slow throttle response.
the outer edge of the pulley will travel slower than that of a larger pulley. It will not increase power.
+sje106 Who are you?
Did you study applied physics?
Do you study automotive engineering? I guess not
Enrique McLeggon I am an engineer.
Yes it will give a better throttle response, but no it will not increase the power. The bhp figure on a dyno will not increase. Performed this test on my own built car. You’ve already embarrassed yourself, I don’t need to do it for you. Have a nice day.
Because of the ratio change it spins the accessories slower. Hence the name underdrive not under drive. Get in a 10 speed bicycle put the chain on the smallest crank pulley then tell me if you go faster or slower. Look at supercharger kits. They increase the boost by either a smaller blower pulley or larger crank pulley or both. The inner diameter speed is the same between the two. The outer diameter speed decreases with a crank pulley. Because the outside travels less distance in one rotation the belt speed decreases. In a perfect world you won’t get belt slip on either the crank pulley or the accessory pulley. Since that belt speed is a 1 to 1 if the crank pulley outer diameter travels 6 inches the belt will too. If the accessory pulley is smaller then it will spin a higher RPM with that 6 inches of movement. The crank pulley will not change rpm but will cause the belt to travel less and slow everything down on the accessories to slow down. This is where in theory you should free up horse power. As objects spin faster their inertia increases it does not decrease. You might want to get your facts straight before you chastise someone else on a subject you clearly have no understanding of. If you went to school like 400 you implied then you need to go back for a refund as they clearly chose not to or were unable to teach you.
sorry but you look like a stereotypical corsa owner
no offense though man
you look like the anoying orange
Yellow headlights suck
turn signals actually, but it's why these cars are so cheap now