My 81x89 gsr just made 273bhp and 158tq on an Land and Sea water braked engine dyno... I'm looking to get some info from someone that had his engine dynoed an then his chassis dynoed. I'm wondering how much power I'm going to loose.

 

my guess is around 18%

 

I just read this the other day.

http://www.jgenginedynamics.com/Tech%20info%20main.html

 

Thanks for the info. I still have no shell, no tranny, and the motor it's still strap to my boys dyno while we massacre an itr header to figure out what the motor likes and get a custom one made. i know i'll put down 250hp~ pump gas.

 

More like 8-12%.

 

Generally 12-15% with Honda transmissions. But, keep in mind you have at least a 10% variance between types of chassis dynos on top of that.

 

237 whp/143 wtq is what you should get on a 13% hp/9-10% tq loss to the wheels which I calculated to be the average wheel loss for our engines and trannies.

 

18-22%, I'd be impress if that engine throw down more than 215whp on like a dynojet. Import tuner mag had the wd40 shootout a while back and the winner went to R&D with their engine made 296 hp on the engine dyno. That same engine was later install into a crx and made 226whp on a dynojet, so yeah it safe to say anywhere from 18-22% driveline loss.

 

like stated above anywhere from 17-22% driveline loss is expected w/ most hondas. If you were rwd you would really be sweatin over the numbers. haha should be a fun motor.
what are the specs other then 81x89? what pistons cams etc?

 

Well i spend all day chopping and welding a new intake manifold like 3 times, ended up with a 6 3/4in runner 44mm I.D. 0 taper. I'm still not done tweaking the engine, we have a program that calculates to a T the diameter of the optimum header after we input the results from the dyno into the program. The program is 99.9% accurate when you feed it with a legit dyno curve, not just number someone pulled out his ***. it estimated 283 with a 240mm wide collector, 44mm tubes and 790mm from the head to the collector. but i want to fire up my staged injection first and then make the header.

tomorrow I'll put this bad bitches to use:


Dual P30s, one controls the entire engine the other one only controls my staged injection.

81X89 GSR
Factory LS rods Crio treated with arp bolts
PR3 pistons 12.45C/R
68mm tb
Endyne street ports, welded and reshaped chambers done locally
BC5 cams 110*int 115*ext
Custom intake manifold (Type R shortened) 6 3/4In Runners
Crank Scraper
Teflon coated: Piston bottoms, Rods and crank
Ceramic coated: piston tops, Combustion chamber, valves, and exhaust port.
Stock injectors on OEM location and 06 GSXR 1000 12holes injectors facing directly into the runners
and bunch of other things that i'm going to keep to my self because i'm sure the motor is braking records on pump gas.

after the manifold i just made today 278bhp at 10k, with the new header it should make 283bhp i'll update tomorrow when i fire the staged injectors.

 

How are you setting records on pump gas? if those were whp numbers then yea... bhp numbers no fraking way. many guys run 250-260whp pump gas....

 

i wanna see your intake mani... bad.

cool build, i wanna see how it turns out.

 

its 13% loss from engine dyno to chassy dyno diff like other guy said!! its not 18 22 % ridicilous!! unless you have shitty tranny

 

20% loss.

 

18% is pretty accurate actually. What does a stock GSR lay down powerwise? 140whp is a pretty solid number from what Ive seen (completely stock, no intake, or anything). Thus, 18% is the winner. Then again I know the S2k has more drivetrain loss and per the numbers it should be right around the same as well. The Supra/SC300s usually have upwards of 25%. Then again, they have BIG, heavy everything (wheels, diffs, axles, trannies).

 

why on earth are you guys just playing guessing games, just simply go on importtunner and compare there baseline runs on completely stock cars. i.e there part one for the em1 they had,or rsx etc.

youll notice they run on dynojets and that most if not all there runs have an average of 13% loss i.e a completely stock b16 with 139whp, and for a matter of fact they had a 141whp baseline so thats 12% loss fyi!
http://www.importtuner.com/powerpage...vic/index.html

heres one with 75k miles,poor maintenence and still pulling 135whp STOCK = 15%
http://www.importtuner.com/powerpage..._si/index.html

and a later version ep3 k20 with 160 stock,guess what it got for loss 13% with 139whp
http://www.importtuner.com/powerpage..._si/index.html



hell 18-20% loss is rediculous,subbies dont even have that kind of loss over a 4x4 setup

 

maybe when the OP is done on the engine dyno and puts it in a car he can tell us what he drivetrain loss is.

 

Good stuff. It was starting to look like an opinion poll in here. In my experience of dynoing many hondas on a Dynojet, the average number I came up with was always 12-15%.

 

Ask DonF he has dyno table .Im pretty sure its 13%

 

Good luck with that.