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why do honda engines make so much more power with less boost

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Old Feb 8, 2007 | 01:40 PM
  #31  
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he was tuned to 18psi tappering to 16, and his redline is 8800
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Old Feb 8, 2007 | 01:45 PM
  #32  
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![/QUOTE]I have never seen a honda b series with a 35r turbo boosting only 12 punds make more then 350. My freinds integra boost 18 on pump 93

Also how high are u or u friends reving the biult blocks. Consider that stock block evo with cams and head studs dont go much beyond 7800rpm. This is important cause the turbo still has power left, but the stock engine on our evos really dont get tuned beyond that. Once built, its a whole different story![/QUOTE]

simply untrue. i myself in my integra make 400whp on 91 octane with 12-14psi of boost on 9 to 1 compression with a t3 60-1, stage 5 turbine wheel, .82ar turbine housing and thats a non balbearing turbo thats smaller than a gt35r. b seris do naturally rev much higher than the 4g63.
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Old Feb 8, 2007 | 01:46 PM
  #33  
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Originally Posted by kjewer1
This doesn't apply entirely, because it's on stock compression, but I just turboed a 06 Civic Si. Turbo is roughly the size of the stock EVO turbo. It does 250 to the wheels with 6-7 psi of boost. The EVO did that stock with three times that boost. Some of it can be attributed to drivetrain loss, and some to compression ratio differences, but it is nice to be able to make that kind of power with so little boost. And with the light weight of that car, it is pretty quick. I have also always heard the theory about the honda's exceptional head flow, but couldn't be bothered to even think about validating it.
thanks for the into but this topic does not really apply to you because of the mismatched compression ratio.
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Old Feb 8, 2007 | 01:50 PM
  #34  
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Originally Posted by BlueIX
I just figure it has to play a big factor since Honda engines are making 100hp per liter. The 1.8L GSR motor makes 180hp and the old 2.0L 4G63 non-turbo talons made like 135hp.
ok there are no such thing a 4g63 non Turbo,( theres some misunderstanding here, please read page six to clear up the Miscommunication!) The motor that came in standard with the Rs' and non turobed Eclispes, Laser's and Talons, all had the engine code for the 420a, Thats the same motor that was in the Dodge Neon, and Chryslers POS motor that always blew the head gaskets. So you need to check your info again.

Originally Posted by Silk
Because most hondas have a higher compression ratio......
You are correct. But you clearly didnt read his post....So please re Read and understand that he's asking about built motors. Most Hondas that are built "GSRs" or b18c's are all higher compression than the EVO;s stock compression. Unles its a LS motor and i bleive that has 9.1:1 last i checked. but i know its somewhere in that neighborhood.


Originally Posted by BlueIX
I always noticed that they have good horsepower but the torque is weak, usually like 100 less then the HP output, on a 400whp car.

If you have ever looked at an EVO graph with a 35R then you see that when its making 500WHP its only making like 369-390 Wtq as well. So thats usually a displacement issue found in all these car smaller 2.0 cars. ever notice that a 2.3L EVO with a 35r always has some serious torque numbers.... Hence when its such a popular upgrade!?

Last edited by Spooldyou; Feb 8, 2007 at 05:18 PM.
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Old Feb 8, 2007 | 01:51 PM
  #35  
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well we both agree that the heads of the hondas flow better, and the rev of the engine combo in question differ about 800-1000 rpm. I would say that this is the main reason.
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Old Feb 8, 2007 | 01:51 PM
  #36  
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UNFAIR!!!!

Well since you're same BUILD Honda motor then you're saying upgraded internals (Piston, Rod and maybe Crank), so ofcourse the components are better so naturally makes more HP.

I will BS if some says that they're Honda is making 400 whp with stock rod.

You're comparing a built motor with with a GT35R turbo on Honda and an Evo with a GT35R turbo upgrade. The Honda has the advantage of a built motor so ofcourse it'll make more power.

To be fair, you must compare both engine built with the same compression. What one upgrades the other has too as well.
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Old Feb 8, 2007 | 01:54 PM
  #37  
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Well fellas, good luck with the answere, as for me, im going to get some din din, aka dinner lol. thanks for some of the info!
peace, J
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Old Feb 8, 2007 | 01:55 PM
  #38  
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From: Dirty Jersey
Answer to question 1: better flowing heads.

Answer to question 2: less drivetrain loss, higher revving motors, bigger turbos (less boost needed to make same power).

Example...a friend with a GSR puts down 315whp on 12 psi of boost. I put down 333whp on 23 psi of boost.

He's running a 61 trim - way bigger than my turbo- and is actually efficient at the 8000+ RPM that he revs to, and then, he's driving only two wheels.

Last edited by anjapower; Feb 8, 2007 at 01:59 PM.
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Old Feb 8, 2007 | 01:58 PM
  #39  
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Originally Posted by riceball777
why can evos always run like 20-23psi on pump gas and built low compression hondas always run like 12-14psi max on pump gas.
This is news to me, and I cannot verify off the top of my head that this is the case. If there is any truth to this, logic implies that it is due to some external factor and not to the engine itself.
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Old Feb 8, 2007 | 01:58 PM
  #40  
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Originally Posted by riceball777
Originally Posted by kjewer1
This doesn't apply entirely, because it's on stock compression, but I just turboed a 06 Civic Si. Turbo is roughly the size of the stock EVO turbo. It does 250 to the wheels with 6-7 psi of boost. The EVO did that stock with three times that boost. Some of it can be attributed to drivetrain loss, and some to compression ratio differences, but it is nice to be able to make that kind of power with so little boost. And with the light weight of that car, it is pretty quick. I have also always heard the theory about the honda's exceptional head flow, but couldn't be bothered to even think about validating it.
thanks for the into but this topic does not really apply to you because of the mismatched compression ratio.
Thanks for reiterating the first four words of my post, never know when someone might not get it the first time.
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Old Feb 8, 2007 | 01:59 PM
  #41  
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Originally Posted by tvbf1
UNFAIR!!!!

Well since you're same BUILD Honda motor then you're saying upgraded internals (Piston, Rod and maybe Crank), so ofcourse the components are better so naturally makes more HP.

I will BS if some says that they're Honda is making 400 whp with stock rod.

You're comparing a built motor with with a GT35R turbo on Honda and an Evo with a GT35R turbo upgrade. The Honda has the advantage of a built motor so ofcourse it'll make more power.

To be fair, you must compare both engine built with the same compression. What one upgrades the other has too as well.
you are incorrect

turbos, engine design, compression ratios, and displacement is what makes power

i said with all things being equal the honda will make more power

pistons and rods do not make more power!!!!!! they simply make the engnine stronger and allow for more boost.

a stock 8.5 compression evo motor will now make any more power than a evo with forged rods and forged 8.5 compression pistons when the boost pressor is the same
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Old Feb 8, 2007 | 02:00 PM
  #42  
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I just want to blame you guys now for the Honda Guy that I knock out that says his 1991 GSR is a better car than my EVO and the 4g63 is the worst designed head ever created.


I cant WAIT till those nerds for the honda forums read this they'll go nuts!
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Old Feb 8, 2007 | 02:02 PM
  #43  
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Originally Posted by Ted B
This is news to me, and I cannot verify off the top of my head that this is the case. If there is any truth to this, logic implies that it is due to some external factor and not to the engine itself.
yes its true. and i would like to know why
it is completely unheard of if not impossible of a honda to run 20-23psi of boost on 91 octane pump gas like that of the evo even when the honda has the same low compression like that of the evo
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Old Feb 8, 2007 | 02:12 PM
  #44  
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From: CaLi4nia... home of the ****ty 91 octane
Before I got my evo I was working on building my k20a2 turbo! Rods sleeves pistons, the works. And a 35R turbo kit. Car would be pushing roughly 20-22 psi and would make around 400-500 whp... That's fully built and after 10k in labor and mods.. So I didn't do it and bought a turbo car.. Hense the evo lol!
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Old Feb 8, 2007 | 02:12 PM
  #45  
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Originally Posted by riceball777
yes its true. and i would like to know why
it is completely unheard of if not impossible of a honda to run 20-23psi of boost on 91 octane pump gas like that of the evo even when the honda has the same low compression like that of the evo
it's probably the integrity or lack thereof of the open deck aluminum block with such high boost.

with a sleeved honda motor, I don't see why they couldn't run the boost that Evos do on pump.
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