mike93eh

whats the highest psi/horsepower have you had your 15g greddy turbo to? im planning on maxxing mine out and was wondering if it would be within my goals or if im gonna need a bigger turbo. like to stay with this one though since its brand new. im at 10psi right now making a little over 200 whp&torque

JFK78

It'll spike to 16-18 psi, but only hold 15 psi. About 250 whp. Do a search for posts made by me, I have a lot of info already posted in older threads.

mike93eh

yea i had a vacuum line melt before and it spiked to 17psi.

250whp huh? hmm do you even need a built block for 250? is yours built?

ill check out your threads, thanks

lshatch1.8

jfk you daaa man..! im also going to push this tiny turbo this season at the track right now its pushing 6 psi till i get my ecu fixed after that its going up...... i also wondered if the 18g( turbo off the 99 si kit ) would fit in place of the 15g

mike93eh

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lshatch1.8 &raquo;</TD></TR><TR><TD CLASS="quote">jfk you daaa man..! im also going to push this tiny turbo this season at the track right now its pushing 6 psi till i get my ecu fixed after that its going up...... i also wondered if the 18g( turbo off the 99 si kit ) would fit in place of the 15g </TD></TR></TABLE>

yes i was wondering also if the 18g is a direct bolt replacement for the 15g kit..

lshatch1.8

yeah im only shooting for 250 hp on stock bottom end but i dont think that 15g would be a good choice to do it i mean i know it can be done but i wonder how long that little turbo would last....

urbansi

Well i know that people have pushed the 18g's around 15-18psi, as for the 15g's a flow chart will help in aiding the answering of your questioning. As for fitment i know that 18g's use T-25/28 flanges as well as the 16g's but i am not positive about the 15g.

mike93eh

anyone have a closeup picture of a 18g?

Kelly.

i made 305whp 278tq with a greddy 19t

https://honda-tech.com/zerothread?id=1431582

urbansi

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mike93eh &raquo;</TD></TR><TR><TD CLASS="quote">anyone have a closeup picture of a 18g?</TD></TR></TABLE>

what exactly are you looking for

mike93eh

see if its a bolt up affair to the 15g kit..

PRDM

Well urban said the 18G has a T25/T28 flange... And as far as i Know the 15G also has a T25/T28 flange... So they should bolt up...

wilham320

iTrader: (1)

here is my old write up on a 18g install with a 15g manifold.... never got to finish the install.
http://turbod16.com/viewtopic.php?t=9265

I used to have the record for the 15g at 252whp on a stock block.... but i got topped by 4hp. (although his was a built motor)

mike93eh

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wilham320 &raquo;</TD></TR><TR><TD CLASS="quote">here is my old write up on a 18g install with a 15g manifold.... never got to finish the install.
http://turbod16.com/viewtopic.php?t=9265

I used to have the record for the 15g at 252whp on a stock block.... but i got topped by 4hp. (although his was a built motor) </TD></TR></TABLE>

elbows are different, well crap.

you only have 235whp on 15psi??

lshatch1.8

its all in tuning buddy im sure the 18g on our sohc would kick ***......

mike93eh

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lshatch1.8 &raquo;</TD></TR><TR><TD CLASS="quote">its all in tuning buddy im sure the 18g on our sohc would kick ***...... </TD></TR></TABLE>

i know i made 190whp and 190 ft. lbs. on 10psi UNTUNED AND WITH A BLOWN HEAD.

i would get the 18g if i could also find the 18g downpipe..

lshatch1.8

wilham really nice write up i have been looking for soemthign like this for ever... you could just get a flange and have a downpipe made a flange for like $60... im going to get one when i save some money maybe ill push the 15g this season and over winter do the 18g unless soemthign pops up then i will upgrade for sure....

wilham320

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mike93eh &raquo;</TD></TR><TR><TD CLASS="quote">
you only have 235whp on 15psi??</TD></TR></TABLE>

235 around 14psi... low compression 1.5L with bone stock head/cam at 2600 ft.

my cam'd, high compression 1.6L made 252 at same boost level

liam821

I had a friend back in the day that had a fully built sohc by JG, full headwork, and a greddy kit (donno why...). He ported the wastegate on the greddy kit to help hold higher boost and was able to make 304whp with it on race gas. Im sure hes pushing alot of hot air, but on race gas its all good.

liam