jdmracer90

okay i have a d15b7 block with a y8 head wit y7 internals
the compression is around 10.7-10.9: 1
and im running a t3/t04e turbo
at around 7-10 psi with a custom ramhorn.
im using 450's injectors and crome chipped



i need some insight at where i would have the timing at and if the compression is too high to run on 91 octane im looking to run around 10.8-11.2 a/f form low vac going onto boost
and keeping timing around the same as stock maybe retarding it a couple degrees


any help will be great.....
P.S no nooobs answer!!!!!! i dont wanna hear your
* dont go past 200whp
* be conservative
* make sure your tuner know what he's doing
* make sure you dont detonate

alright? so any help would be awesome thanks in advanced

2BarRacing

where is it at now? i have tuned a couple 10:1 cars but they were Bs i wanna say i was around 12-15* of timing in boost rpm dependent. this was on 93 oct not 91. I know you say dont throw a "dont be conservative but any changes smooth the map around it so that theres not drastic changes the car sees. I know the ecu pulls from 4 cells at a time but it makes the run wayyy smoother also how are you retarding by psi of doing a step retard

jdmracer90

right now im running all motor
but i have the parts to install.
im just trying to find some info to see if
ima have any huge problems on this setup

so theres going to be a need to retard the timing around 12-15 degrees?
on boost? what i meant when i said dont say be conservative was just dont say that,
like if you got some more info besides just saying "be conservative" then i would love to hear it and thanks for replying =[/]

BRIAN MP5T

That is a lot of compression for FI.

You will have to retard like a retard.

2BarRacing

no what i said is that if you look at your fuel map start out by retarding say 1.25* per psi that should be a good start also with your fuel set the comp efficiency at around 130% that should net you a nice rich safe base map to start with

jdmracer90

thank you very much for your help,
sorry if i sound like a complete noob but what does comp mean?
do you mean compression or

2BarRacing

compressor aka the money side of the turbo.

jdmracer90

ohhh okay thanks for the input.

twocamvw

apples to oranges.. but i boost my vw with roughly 10.5-10.8to1 compression, on pump gas.

Pootie

there are a lottt of high compression turbo builds out there. There are a few 13:1 compression cars. My next build will be 11:1.

just have to have a gooooooood tuner and sleeves will help , lol

a lot of power at lower boost.