D15b7-Vitara's/rods. Which turbo?

[1SOL2NV]

yall making me feel dumb ! ... keep the post coming very informative guys !!

[redciv1]

No... proper tuning=more boost!!! I'm running 10.5:1 Compression on 23 psi daily and have been for a while now... and I could run even more if I wanted... and as I stated before... the H beam rods on those websites are for the D16 engine... which will not work on a D15... and if you drop your compression that low on something with as little displacement as a D15, I promise you that you will not have the bottom end power that you are looking for...

So you are running a 10.5:1 compression on your motor and it's boosted to 23 psi, interesting? I really appreciate all of the info and tuning is a definite.

[sullen]

tuning is alot of it, but too much compression can still blow the HG. so yea, high compression+high boost=blown HG. tuning is a big factor of it though. gotta keep stoichiometrics.

[SiRed94]

tuning is alot of it, but too much compression can still blow the HG. so yea, high compression+high boost=blown HG. tuning is a big factor of it though. gotta keep stoichiometrics.

yeah i wasn't saying that you can run maximum amounts of boost on something like 12:1 compression... I'm just saying that you dont have to lower your compression ration to 8:1 to be able to boost your car "safely" or "reliably" but yes... a head gasket can only take so much.... my point was that if the "perfect" 14.7:1 air fuel mixture is present which is gained through proper tuning... alot higher compression ratios are possible with boost without detonation....

[scttydb411]

yeah i wasn't saying that you can run maximum amounts of boost on something like 12:1 compression... I'm just saying that you dont have to lower your compression ration to 8:1 to be able to boost your car "safely" or "reliably" but yes... a head gasket can only take so much.... my point was that if the "perfect" 14.7:1 air fuel mixture is present which is gained through proper tuning... alot higher compression ratios are possible with boost without detonation....

14.7:1 and boost? try 11.5:1 to 12.5:1. 14.7:1 and boost = boom, crack-a-lac on almost any useable compression.

[redciv1]

14.7:1 and boost? try 11.5:1 to 12.5:1. 14.7:1 and boost = boom, crack-a-lac on almost any useable compression.

Thanks Sctty, I thougt the magic# was 12.0:1 for A/F. Sctty's the man. I understand the compression is low however this won't be a on the road tune but hopefully and hour or two of tunning.
BTW, I did plan on using the z6 crank. I didn't realize they were for the z6 only.

[SiRed94]

14.7:1 and boost? try 11.5:1 to 12.5:1. 14.7:1 and boost = boom, crack-a-lac on almost any useable compression.

indeed... yes... sorry I had that number stuck in my head... that is just the middle point... basically zero.. anything lower is considered a rich mixture anything higher is lean... I apologize for my misinformation... but reasons like this is why Scotty remains as "The Shit" hahah thanks for the correction...

[redciv1]

I appreciate all the help. One question though that I was bugging me. Aren't alot of the T25's left pretty warned considering they haven't made 2nd gen Eclipses' in almost 10 years?

[SoLJames95]

Okay I will tell you, and Scotty correct me if im wrong, Because you tuned my car so much. Ive blown 2 D15b7s, (This is not cuz of Scotty,I have a led foot and I push my car to the limits.I love you Scotty) Stock internals. I run a T25. The car ran well at 10 pounds, and you can tickle 11 pounds sometimes... Never do 12. If you want a quick spool but around 300 and not worrying about boost falling off, I suggest the gt28R BB. That will be in the range. No lag all boost. The D15 is meant to be under 250. Dont make the same mistake that I did.
MY

[scttydb411]

you are correct. d15's i recommend 200-210 max. the t25 starts blowing hoter air around 11-12psi and topping it's eficiency at that point. the gt28 is a good suggestion too. most t25's you'll find are pretty tired, but there are a few good one's still out there.

james-your car probably could've held 11psi all day long, but 12psi...wasn't it more like 14psi? timing and fuel of 11psi at 12psi or 14psi=boom! you could've been ok in those instances, but not w/o a mapsensor that can extend that far. you gotta pay to play.

i know ya love me-james!

[SoLJames95]

you are correct. d15's i recommend 200-210 max. the t25 starts blowing hoter air around 11-12psi and topping it's eficiency at that point. the gt28 is a good suggestion too. most t25's you'll find are pretty tired, but there are a few good one's still out there.

james-your car probably could've held 11psi all day long, but 12psi...wasn't it more like 14psi? timing and fuel of 11psi at 12psi or 14psi=boom! you could've been ok in those instances, but not w/o a mapsensor that can extend that far. you gotta pay to play.

i know ya love me-james!

Ill see you tomarrow on the dyno, my car is beingboosted right now. LOL. 10 pounds, 3rd times a charm.