What IC hard pipe size would you recommend for this supra?

[arod]

I am going to make the IC hard pipes upgrade and was thinking going 2.5" all around but I have a friend (he has a MK4) that is telling me to go with 3". I do not want to suffer from much turbo lag and I think 3" will be overkill.

This is my car setup:
7MGTE with R154 trans
3" exhaust no cats
FCD
APR Head Studs
MGH
Garret TO4 60-1 with modified CT26 housings
(Here is a link to it: http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=140246158042&ssPageName=ADME:X:RTQ:MOTORS:1123 )

Spearco Intercooler
(Here is a link to it: http://cgi.ebay.com/ebaymotors/_Car-Truck-Parts-Accessories__INTERCOOLER-Polished-FMIC-Buick-GN-Supra_W0QQitemZ150267539734QQadnZCarQ20Q26Q20TruckQ20PartsQ20Q26Q20AccessoriesQQadiZ2865QQcmdZViewItem?hash=item150267539734&_trksid=p3756.m14.l1318 )

My power goals are 400-450 RWHP (I know I need more stuff for that like injectors ect.) what size would you recommend.

Thanks in advance

[Wills7MGTE]

2 and half inches I'd say maybe 3 max

[Facime]

with power goals of 400hp, 3" would be a waste. 2.5" will be fine.

[ms07s]

2.5 will go through the fender pass and clear the swaybar easier.

[tissimo]

4" for a ct26, 7" for a t4

[MKIIINA]

2.5 in and a bigger turbo!

[arod]

4 votes for 2.5"
0 votes for 3"
1 vote for 7" LOL

[89TargaT]

2.5". You don't really need 3" for your power goals.

[adampecush]

i'm going 2.75 with a similar setup....but I'll be moving to a bigger turbo shortly, so I'm giving myself some room to grow.

[s383mmber1]

Is it jsut me or will that turbo not work on your supra....

[arod]

Is it jsut me or will that turbo not work on your supra....

What do you think of it.

I am open for opinions.

[s383mmber1]

Its listed for an MR2. These turbos DO NOT fit.

[Keros]

At 400hp, 3" for ballerness, 2.5" for practicality :P

[92nsx]

I'm going 2.5" on hot side and 3" on the cold side. if this helps you at all.

[Mr.PFloyd]

Its listed for an MR2. These turbos DO NOT fit.

Umm... it's a single entry ct 26. They are identical unless he ships a twin entry.
It fits.
Oh i am going 2.75 for IC pipes. Why? Because that is the size of the TB.

[starscream5000]

Here, (http://www.supramania.com/forums/showthread.php?t=44148) use this, it will help you out more than just guessing ;).

[arod]

Here, (http://www.supramania.com/forums/showthread.php?t=44148) use this, it will help you out more than just guessing ;).

Thanks for the info.


Well I made the decision, going 3" to have room for a bigger upgrade :naughty:

Thank you all for your help

[noah89t]

i used to have 3" ic pipes, they fit, but were a little big in my opinion.

[sethron71]

My power goals are 500-550rwhp and I believe 2.5" is sufficient. Maybe could use 2.75" But since that is my max goal and going for 450rwhp daily it keeps lag down and is more drive-able. Also if you are not running a FFIM I would go with 2.5 or 2.75 not 3" because you are gonna have a good bit of lag!

HTH,
Seth

[Orion ZyGarian]

540rwhp (630 HP flywheel, 844 CFM) according to the not2fast.com calculators will require 3" IC piping... 470rwhp (740 CFM, 550 HP flywheel) is the upper limit for 2.75". From 470rwhp-540rwhp, 3.0", from 540rwhp to 660rwhp, 3.25". That's with assloads of assumption, such as a constant 15% drivetrain loss, assuming that this calculator has a correct CFM to HP ratio, etc. etc.

[arod]

540rwhp (630 HP flywheel, 844 CFM) according to the not2fast.com calculators will require 3" IC piping... 470rwhp (740 CFM, 550 HP flywheel) is the upper limit for 2.75". From 470rwhp-540rwhp, 3.0", from 540rwhp to 660rwhp, 3.25". That's with assloads of assumption, such as a constant 15% drivetrain loss, assuming that this calculator has a correct CFM to HP ratio, etc. etc.

Lots of interesting info on that webpage, Thanks