H22 tuning issue

[trickeng]

we have recently started using hondata and are running into a pretty big problem. here it is.
95 H22 stock bottom end
obd1 P72 started with base boosted GSR map
830cc injectors
intake and inline pump

fjo lambda meter

we tuned the low cam without a problem. car ran in the high 11- low 12:1 a/f. no stuttering, hesitation and it pulled very strong.
when proceeding to tune the high cam we were shooting for mid 11:1 to be on the conservative side with total timing from 5lbs of boost to 10lbs at 18degrees.
running 11.5:1 and 18degrees total timing, full thottle 7000rpm we have broken one set of ring lands and melted a piston on the second set.
the first ring lands may have been a boost spike to 14lbs, but with the second set, everything was were we thought it should be.

10lbs of boost @ 18degrees total timing. #2 piston melted, #3-4 broken ring lands. 93octane gas.

any help would be appreciated or direction to a post that has good tuning tips/processes.

[prelude23]

hey dude, your running entirely to much boost with that high of a compression. your gonna continue to burn piston rings, chew piston heads and if your not careful youll tear up your entire bottom end. i had the same idea of running a high compression but i was advised against it. either lower your compression to a 9:1 or 8:1 or lower you boost. i recommend lowering the actual compression itself. with a lower compression you will be able to run a pretty safe 8 to 9 psi of boost. one final problem your experiancing is that your octane rating is entirely to low. when you run that much boost, and that high of a compression a 93 octane wont cut it. 100 octane would be good but like i stated earlier, youll still eatup your engine components cause of the boost and high comp. lower your compression first, then slowly tune your camgears, then tune the boost. you should notice good horse gains, as well as less likely of damaging a wonderfully strong engine.

[Dynotuner]

10 psi of boost with what kind of turbo? I didn't see what size turbo you're running in your post. If you're running 10 psi with a small turbo, that's fine, you need to look for a timing offset problem perhaps - your indicated timing may not be the actual timing. If you're running 10 psi with a large compressor (i.e. TO4e w/60 or something) you're bottom end will probably not hold up. Boost pressure is not the same as air flow volume. Your engine could probably do well at 10psi with an "off-the-shelf" T3/T4, but if you've got a well built upgraded turbo, the airflow volume will be significantly higher at various boost levels. With your fuel system selection, it sounds as if you're trying to support 600+hp.

[markr-nc]

Running that much compression with boost on 93 octane pump gas is detonation city.
You probably need at least 100 and maybe 108 octane to be really sure you aren't going to detonate when you boost it up.
Winter time pump gas is made to flash off really easily at low temperture
which is exactly what you don't want in a turbo engine.
You might have survived if you had pulled the timing back to maybe 6 or 8 degrees.
You really need to put some good lower compression pistons and at least a block guard in it.

Good luck, Mark Riley

[20lb.teg]

Running that much compression with boost on 93 octane pump gas is detonation city.
You probably need at least 100 and maybe 108 octane to be really sure you aren't going to detonate when you boost it up.
Winter time pump gas is made to flash off really easily at low temperture
which is exactly what you don't want in a turbo engine.
You might have survived if you had pulled the timing back to maybe 6 or 8 degrees.
You really need to put some good lower compression pistons and at least a block guard in it.

Good luck, Mark Riley

See and your kind of screwed both ways because not only do you have to get the pistons but you really want to get the sleeves as well. reason being is taht H22's and F series blocks have something called nikosil as a coating... Forged pistons won't work without special rings. Wiseco and JE make a set of rings that will suposablly work with this block now but do you want to take a chance... If they don't work perfectlly it will completely tear up your sleeves and your brand new rings and you'll have to pay to get new sleeves anyway + the new rings... My advice go with a B series No, but really, look into getting some new pistons and sleeves... Hope this helps.

Later,

Sean C.

[Islander]

we have recently started using hondata and are running into a pretty big problem. here it is.
95 H22 stock bottom end
obd1 P72 started with base boosted GSR map
830cc injectors
intake and inline pump

fjo lambda meter

we tuned the low cam without a problem. car ran in the high 11- low 12:1 a/f. no stuttering, hesitation and it pulled very strong.
when proceeding to tune the high cam we were shooting for mid 11:1 to be on the conservative side with total timing from 5lbs of boost to 10lbs at 18degrees.
running 11.5:1 and 18degrees total timing, full thottle 7000rpm we have broken one set of ring lands and melted a piston on the second set.
the first ring lands may have been a boost spike to 14lbs, but with the second set, everything was were we thought it should be.

10lbs of boost @ 18degrees total timing. #2 piston melted, #3-4 broken ring lands. 93octane gas.

any help would be appreciated or direction to a post that has good tuning tips/processes.

Could you send me the program you used on your H22A prelude? I'm using the P28 ECU and I already messed my engine up once. Now I'm rebuilding it so I would like to have a good map to start out with. my e-mail is lovehonda7407@msn.com