hi guys im going for a 2.5 build and i need your honest opinions i need your fact and figures graphs would be very much apreciated. im looking for the best turbo for a 2.5 something that will give me full boost by max 3500rpm or earlier and hold boost till about 7500rpm is that possible on a 2.5??? im looking to achieve around 470bhp and as much torque as possible. owners reviews would be appreciated, im aware of the md321t md321t plus the fp green and the fp green hta the gt30 is there anything thats in tat leauge?pub figures dont realy matter much to me mainly response and spool up as the car will be used mainly on the road. the occasional track maybe twice a year and mainly the 1/4 mile strip.

ver 4 type r i have all the supporting mods in place ppg. twin exedy , injectors etc.

the engine

EJ257 Semi closed deck block
79mm crank polished and balanced
ACL Race bearings
pauter Spec Rods
CP Custom pistons

 

if you are aware of the above turbos ....you dont really need to ask

 

The best bolt on without question are the MD321T and T+.

These are proven time and time again and outspool any of the competition by quite some way.

They are without doubt THE best turbo for a road going 2.5.

Source one from Mark at Lateral Performance.

 

The MD321V is pretty spectacular too

 

LOL you're assisting in its development so that doesn't count

 

Eh?? First the H then the T, then the T plus, now the V.....Too many bloody turbos! Where does this one fit in the range?

Ns04

 

Havent you got an FP Green on your 2.0 at the moment?

 

You're forgetting the 321L and the 321S too.

I would imagine that the V is bigger and more powerful than the T+

 

Correct.

 

Duncan what kind of results have you seen so far, you have me very interested

Banny

 

So far 490 bhp on unboosted fuel but more to come when I get the map finished and I believe a fair bit more on higher octane fuel or with methanol/ethanol etc.

Once testing/development is finished then a full review will be published.

 

Look forward to seeing it in action soon Dunc...

 

also the MD195S and MD555 series

 

im currently runinng a 20G with reverse inlet manifold with 10% meth
i got 402 on dyno dynamics at 1.45 bar, on the road it hits 1.7. so the gt30 isnt what peeps are making out. could you run an external wastegate and screamer pipe with the md321t plus??

 

You got me confused.... why are you saying that about the GT30 ?

Why would you want to run external wastegate and screamer pipes on a std fit turbo?

 

confusion reigns high in this thread.
OP needs to differentiate between a GT series GT30 from Garrett and a hybrid gt30 which used *******ised parts from IHI, Garrett and cadburys.
The gt30 hybrids do not make the power of a genuine GT30 or the fabled GT3076iirc (GT30R).
Every other turbo that makes 400bhp in the standard location claims to be a gt30

The genuine Garrett item needs a twisted setup with an external gate and screamer.
Standard fit gt30 hybrids are still internally gated.

The md321T is proven time and time again, the T+ has a little bit more to give but at a small cost.
The 321V is witchcraft and heresey
The md555 isnt proven sufficiently but is making good power and spool although early indications have been that they suffer from surge quite badly.

I have no personal experience of the FP green or red or purple or whatever other colour they are attaching to it this week but people who have run them have been quite vociferous in their defence.

I bought a brand new turbo not so long ago and with all these options available to me, I still plumped for an MD321T.

 

 

A genuine GT30R (rotated with external wastegate) will make in excess of 500bhp on Optimax.

Mine made 452bhp @ only 1.4 bar on a 2.5

 

gt30r is a good turbo but the md321t is the best bang for your bucks

 

sorry for the confusion, i have a mate of mine who has an s13 he has an external wastgate and screamer pipe and it sounds mental, and as im going to do all the engine work i though it would be a good idea to have it fitted all at once. is it possible to fit an external wastgate and screamer pipe with the md321t plus?? is there a lot of technicalities involved?

i just didnt see many people talking about the GT30 at the start of the thread so i thought that it wasnt in the same leauge as the md321t.

 

Its the league above

If you want an external wastegate and a screamer pipe go for a rotated GT30 or GT35 setup. Both will trounce the MD321T, T+ and dare I say it probably even the V.

 

An RB5 I have been involved with did 475 bhp and 434 ft lbs on Monday. (Dastek rollers at Northallerton)
2.5 l on MD321T very nice car.
A cheaper alternative would be the FP Green but I have no graphs for that but speak to Jase at Area 52 who has graphs he can send out to you.
Your goals are quite achievable in terms of power and spool on a 2.5.

 

cheers harvey

 

This is the MD321V compared to the FP Green on mine.

Both runs on the dyno at Zen on unboosted pump fuel in 3rd gear.



Just to add a bit more info on this, the FP Green produced good figures for me and worked a treat but as you can see from the graph, the bigger ball bearing turbo gets going quicker and just keeps ahead. In theory it should be laggier but after now having had time to make changes to the map it outperforms it all the way up.

 

thank you dynamix looks like il be speaking to mark at lateral for the m321v.

 

Mus mate i don't really understand why you wont a 2.5?

Why not just put the MD321T on to your 2L?

That should make 450 bhp and save you grands

 

The 2.5 suits his driving style as he likes alot of low down torque, that should explain it

 

He has to much money if you ask me

 

MD321T is a quailty turbo, works well on both 2 and 2.5l engines.

However, it is better suited to the 2.5l engine, whilst a MD321H is better for the 2l if I remember corrctly.

 

im not a fan of lag, i think the md321t works well with 2.5 and new age 2L im not sure about ver 3 or ver 4 scoobies.

you will be suprised ash the property market aint doing so well thats why im going for a 2.5 otherwise i would of gone for 2.35.

and besides the 2.5 and ive been speaking to slowboy about some new ideas its gona be intresting.

on 2L i wouldnt take it above 450 even at 450 there are as laggy as anything once they get going they are great but you can get caught out so easily. i want a car thats a bullet on the road and responsive im happy to use meth again.

the only set back about the 2.5 is that they are not made for reving i think 7000rpm or 75000 max which i dont mind that much as im not one who like to rev the crap out of them. should be intresting