hey everyone. i have an greddy 18g kit bolted on my si. i know it definitely isn't the best kit out there, but it is very streetable. My questions are:

1. what is the max whp that the kit is capable of?

2. i have an extra set of saturated 750cc's, these should provide sufficient enough fuel for this kit maxed out, right?

3. are there any prefabricated bolt-on mini-rams and downpipes available for this kit?

4. also, how much flow does the stock fuel pump provide? will i need to upgrade to something with more flow and if, walbro 195 or 255?


thanks in advance!

 

ne1? ttt for answers!

 

4 threads below yours is a 9 page thread on this very topic.

https://honda-tech.com/zerothread/1836946

 

thanks man. usually i look or search but i never have much faith in it.

 

I made 300whp at 15psi with 440cc injectors. Im sure you make 400-450whp out of it with a upgraded manifold, external wastegate, and 3" downpipe with will not let you keep AC.

 

450whp from an 18g?

 

im only guessing......there people on here that have different style manifolds....

 

450whp on an 18G is stretching it at the least. That's at over 25-30psi thrown at it, and is not recommended by any means. The turbo is good to about 350whp realistically, and works well with Honda motors for a nice street push. The only limiting factors are the internal wastegate flapper door, which causes some problems, simply because of its small diameter (about 32mm)

 

thanks. but methinks i got a bigger problem now than just worrying about turbo specs. i'm pretty sure my head gasket's blown. **** on me, since i'm an amateur mechanic at best. i'm gonna try to do it myself-and learn since i figure i'm probably going to be dickin around with honda inline fours for a long time coming. thanks guys.

 

on my 00 civic si with greddy 18g, i made 256 @13psi. My comptech exhaust (2.25in) rob hp, i have now switched to 3in exhaust.