Jcards26

I just recently installed a greddy 18g turbo on my 00' gsr with about 108K on it. I tuned it through chrome pro by a local guy in rochester who uses a dynomax dyno, which is a low reading mustand dyno or something. On 9lbs of boost i made about 215whp which on a dyno jet would be around 240-245whp. When we tried to increase the boost up to 10 and even 11lbs, my car made like 190whp on his dyno. He told me that this was due to valve float. I really dont see how my car could have valve float when i see stock gsr blocks here on h-t making over 250 whp no problem. i have talked to a few people about this and some say there might be something wrong with my motor. But ever since the tune, on really hot days, start-ups have been really sketchy and sometimes it will shut off randomly in between downshifts. I rly need to check compression soon, and i also heard about something called a leak down test could help me determine if the block is fucked. If anyone has had an experience similar to this and might know what the problem is, please let me kno.... any and all advice is welcome. Thanks guys


Other than those few problems the car runs fine and pullss pretty good

Schister66

i hope you get this resolved...i can't really offer any help other than i doubt you're having any kind of valve float problems...there are a lot of guys running the stock heads at a lot higher boost than that

Archidictus

Valve float? Are you serious? THAT was his excuse

0morgan@synapse motorsport

valve float seems very unlikely unless you are pushing past 8400-8500 rpms.

get that compression and leakdown check taken care of. those test can tell a lot about a motors health.

.dave

I was never really impressed by that guy. My suggestion is do a compression test, maybe a leakdown and then take it up to Synapse in Albany. They're probably the only people in this area that I'd trust with tuning right now.

agrn93ls

i would DEFINATELY move on to another tuner. you arent having valve float unless you have valve spring issues. and then you would most likely bend a valve anyway.

numbnuts22715

Ive got the same setup. about the same power at around the same psi... 246/221.

My tuner couldnt push it past that power either, but it was because of the downpipe.
Are you running the stock greddy 2" downpipe?

jmm96gsr

iTrader: (1)

compression and leakdown test BTW, your car looks badass

marvindjojo

If ya don't see smoke, it ain't broke..(yet) get the engine tested, and have the car re tuned by someone else...... with that small turbo, you also don't need to past the stock red line too much as it will not produce more power, (DP, Inj, size)

Jcards26

yea just checked compression yesterday, reads 140, 145, 150, 150 so im pretty impressed with that. stock greddy downpipe as well i think 2.5

boostdEM1

I suggest a compression test and a leak down test to determine whats goin on

alex_s817

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jcards26 &raquo;</TD></TR><TR><TD CLASS="quote">yea just checked compression yesterday, reads 140, 145, 150, 150 so im pretty impressed with that. stock greddy downpipe as well i think 2.5</TD></TR></TABLE>

anyone else think thats low? i mean they arent varying much but my old teg ls motor was like 165 across with 200k

boosted k20

u have other issues. turning up the boost should have increased power. check all your intercooler couplings. whats your exhaust size? too small of an exhaust will reduce power greatly

Jcards26

i checked all the couplers nothing is blown off obvisously bc my car is still generating boost. yes the downpipe is a little sketchy but i am runny 2.5 inch exhaust all the way back. i rly dont need 3" exhaust unless im planning on making over 300. i also just realized something, being the stock mapsensor on hondas is set for only 10lbs, trying to go over would decrease horsepower, right? i think one of my problems is i need a 2.5 bar mad sensor upgrade if i plan on increasing the boost anymore.

boosted k20

even if u go over the limit of the stock map sensor, the car should still make more power with more boost. i've run about 13 psi on stock map sensors. (just had to make sure the timing and fuel in the last column of the program is set conservative)
u probably have a problem with ur exhuast system. it could be a bad manifold design, or too small of an exhaust. u have more air coming into the engine from more boost, but u can expel the exhaust gases fast enough. post up some dyno graphs so we can help u out more

numbnuts22715

my tuner said that because of my small tiny 2" downpipe, that when he tried turning up the boost it was actually hurting me and giving me less power.

Same setup, but not a 2.5 inch exhaust.. I still have a shitty 2.25.

mtny

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jcards26 &raquo;</TD></TR><TR><TD CLASS="quote">yea just checked compression yesterday, reads 140, 145, 150, 150 so im pretty impressed with that. stock greddy downpipe as well i think 2.5</TD></TR></TABLE>

Doesn't this seem low? I pulled 220-230 compression on my gsr...

envee

* Engine compression (No more then 20psi between cylinders.)
8:1-8.5:1 c/r = 150-170 psi per cylinder 8.5:1-9.5:1 c/r = 170-210 psi per cylinder
9.5:1-11:1 c/r = 210-275 psi per cylinder 11:1+ c/r = 250+ per cylinder

taken from phearable.net stock healthy gsr should be in the low 200s

jmm96gsr

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jcards26 &raquo;</TD></TR><TR><TD CLASS="quote">yea just checked compression yesterday, reads 140, 145, 150, 150 so im pretty impressed with that. stock greddy downpipe as well i think 2.5</TD></TR></TABLE>that's your problem

boosted k20

he does have a point with that answer. flow into the motor is alot more than the flow outta the motor

8herout

did you floor the gas petal when you did the compression test?

Jcards26

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 8herout &raquo;</TD></TR><TR><TD CLASS="quote">did you floor the gas petal when you did the compression test?</TD></TR></TABLE> no i did not floor it when i checked the compression. NEW update today..... im soo effin pissed, so far since its been tuned ive driven about 1000 miles. today it finally took a **** on me. it will crank over and i am getting fuel pressure and spark. i thought it could be a clogged fuel filter but i just replaced it and it still wont start. I have no idea what the problem is. I have a feeling it has to do with an electrical problem. PLEASE NEED help.
also i just talked to my tuner today and he said he would retune me because i told him how lean i was.

Jcards26

i almost forgot.... it will crank over and it will start if and only if i am in w.o.t. but i know something is wrong because it runs like **** and sounds almost like 3 cylinders are running. and it will only stay under 1000rpms...

blackeg

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by .dave &raquo;</TD></TR><TR><TD CLASS="quote">I was never really impressed by that guy. My suggestion is do a compression test, maybe a leakdown and then take it up to Synapse in Albany. They're probably the only people in this area that I'd trust with tuning right now. </TD></TR></TABLE>


i tuned my neighbors gsr to 300 hp on 9-10 psi in about 5 pulls. see if your motor is healthy, doublecheck your timing with a timing light, then head on out to albany

agrn93ls

that compression is low

is ALL stock block Head Gasket too?

you should be righ around 200-220 area on stock GSR.

good luck to figuring out the issue.