Choosing the right turbo

[Hillclimber]

Hello all, I've been considering a replacement for our 4EFTE's CT9 recently but am not sure which way to go - either the tried and true TD04L or the Garrett T25.

The CT9 set-up is running around the 150hpatw at the moment and I'd like to achieve somewhere around the 200hpatw mark with the upgrade which I know the TD04L will achieve at around 16 to 18psi but from researching T25's I wouldn't mind going down this track as the initial costing factor seems favourable and the support for spares, lines, flanges, upgrade bits seems better than the TD04L.

I understand the response is not going to be as good as the CT9 which in our application gives good boost from around 2750rpm but I don't want a turbo that has nothing below 5000rpm. The TD04L is often stated to be on full boost at 4000rpm which sounds OK to me but I'd like to know which Nissan T-series turbo will give similar response with similar rewards in HP.

1/. Is a Garrett T25 (ex CA18DET) with a 0.49 A/R exhaust housing and 0.48 A/R compressor housing going to give the same or similar response and HP to a TD04L which features a 0.41 A/R exhaust housing? If not what results should I expect?

2/. What characteristics / power range would you suggest a turbo featuring a T25 0.48 a/r exhaust housing and T28 0.6 a/r front compressor housing would exhibit on a 4E (with supporting mods) and what boost would it be happiest at? How would this differ to a TD04L?

Any help would be greatly appreciated.

David

[gaz d]

i would love to help but i just asked what an intercooler is! so you know more than me!

[Hillclimber]

Thanks Gaz, any help we can offer to you on your learning path we will.

Anyone? Ivan, would you like to comment on any of the questions?

Any help would be appreciated.

David

[artmull]

For 200HP ATW if you do not want to use the TD04, you can use either a T28 or GT28R or try to obtain a turbo with the following specs for use on the
4EFTE:
T3 50 Trim/Stage 2:
Turbine wheel Exducer diameter-----------------49.53mm
Turbine wheel Mayor diameter-------------------63.75mm
Compressor wheel Exducer diameter--------------42.42mm
Compressor wheel Mayor diameter----------------59.94mm
Turbine housing A/R--------------------------------.36
Compressor housing A/R----------------------------.42

[Hillclimber]

Thanks for the reply Artmull, I ended up getting a T25/28 hybrid that features a T25 0.48A/R turbine housing and T28 0.6A/R compressor housing.

I haven't measured the exducer / inducer sizes yet but will when I put a rebuild kit through it.

I'll post results when fitted.

Dave

[HardcoreEP]

We did 212whp with a td04-13g, and that's smaller than a td04L-15g from the WRX. Would never have looked in the Garrett direction, but I guess u use what's available to you.

[gfos019]

Does the td04l have more lag on the starlet? I am in the same pickle as Hillclimber, wanting a bit more power, but dont really want late boost.

I can get a Td04L off a forrester, but its a bit funny, closed boost hose outlet and the wastegate needs a new circlip.
Is it worth getting (really cheap) or should i set my sights higher? It looks in mint condition otherwise, and has only done 20,000km on its original car.

any advice welcome!

Ha ha just realised this topic is from last year... my bad.

[ivan]

I ran a TD04 and was completely dissapointed with the results. The power is not linear which reduces the amount of usable power on demand, and that was crap.
I had full boost at 4000rpm as opposed to 2500 which is a big difference and all round was not happy with the setup.

There are some brand new garrett turbo's that are perfect for the setup, but at a min of 1200 new, some are reluctant to buy it.

Ivan

[HardcoreEP]

I've had the opposite situation here in Jamaica. Most td04, including my own spool early and carry power straight to the red line. The only time we get a narrow powerband from a td04 is when you run it out of its efficiency range usually below 8psi. Running it past 10 or at around 15psi means full power. Most Garretts from my dyno experience testing drop off power after 6000rpm regardless.

We are in the process of replacing a damaged gearbox from a td04L powered car and once that is done I'll give you the dyno figures and sheets.

I must however say again, I think the td04L-15g from the WRX is a big turbo for the 4E, but its better than a Garrett in the real world.

[Scotty]

I ran a TD04 and was completely dissapointed with the results. The power is not linear which reduces the amount of usable power on demand, and that was crap.
I had full boost at 4000rpm as opposed to 2500 which is a big difference and all round was not happy with the setup.

There are some brand new garrett turbo's that are perfect for the setup, but at a min of 1200 new, some are reluctant to buy it.

Ivan

What were you running with the TD04? And which TD04 was it?

I used a TD04-L in my Glanza V and got purely opposite results.
I had linear power and my full boost pressure at the time of .8 BAR was attained in 3rd gear at around 3200-3600 RPM on a regular 4E-FE (Soleil) gearbox. The car was running at .8 BAR with a poorly tuned GReddy e-Manage with an AFR of 11.3-10.5 in some instances. I however, was using a GReddy Profec-A EBC.

I'd really like to know what other devices and engine management you were using to have such a dissapointing result.

-----------------------------------------------------------------------------------

HardcoreEP: I thought the WRX turbo was a TD04-L 13T?

[HardcoreEP]

Sorry was thinking bout my 15g when typing.