bullseye t4 - 550cc good?

[funguy]

hi,

i plan on upgrading my big28 to a bullseye t4 to attain my 300whp goal on pump gas. seems to be really hard on the big28 @ 23.5psi.

i currently have 550cc's and 190 walbro. will i have enough fuel?

 

[larsrya8]

hi,

i plan on upgrading my big28 to a bullseye t4

Care to be more specific?

 

[funguy]

it will either be the M trim or the V trim. All i want to do is to get into 12's and i will be happy.

 

[IPT]

For only 300hp 550cc injectors will be ok. Just use a datalog and watch your duty cycle. If you get close to 90% you are pushing the injectors too much and will need to upgrade again.

 

[prostreetdsmx1]

i'm sure you didn't mean to say T4. that is a much larger based turbo. The bolt on v-trim can get you there and the 550s will do just fine with proper tuning.

best of luck to you.

 

[GPTourer]

Yeah, that's what I was going to say. a T4 is huge and overkill for what you are trying to accomplish. You'd be much happier IMO with one of the smaller quickr spooling turbos mentioned above and still have a little headroom for more power later on.

 

[Steve93Talon]

A T04B v-trim comes with a P-trim turbine wheel and is in the T4 family, not T3/T4. The Big28 will easily get you to your goals, BTW.

 

[funguy]

thanks for everyones answers.

when i bought the car, the car "supposedly came with a bigt28 turbo". i am kind of doubting the fact that it is because i have a moderate tune safc -28 to -31 and i'm still running @ a 11.2 - 11.4 afr. thats running at a 23.5psi. i have ran a best of [email protected]. on a warm night. On another night I ran with a little more rich tune (cooler night), i ran [email protected] <-- this run power shifting.

I even let my friend drive and he only got a best of 13.9............... All of this done on 94 pump.

the car runs strong, no hesistation, no signs of boost leak.

 

[DSMSpyder99]

well a T25 (that comes with a 2G) wont hold more than 15PSI after 5500RPMs. It is safe to assume you have a upgraded T28 or AT LEAST a stiffer actuator