1993 MR2 Turbo - Tuning Stages

Re:1993 MR2 Turbo - Tuning Stages (MR2QIK)

Wed, 17 Oct 2012 14:50:13 GMT

To be fair.....it is likely only an isolated case(s). But it's another aftermarket item that can fail when Toyota valves are proven. One thing I've learned over the years, is to avoid changing items just for the sake of it (but we all do to some extent).

2. Richard can't say he never had a problem afterwards because the car was sold shortly after it was repaired. Many of the big HP US 3SGTE's have had valve issues for numerous reasons.

Re:1993 MR2 Turbo - Tuning Stages (surok)

Wed, 17 Oct 2012 14:32:38 GMT

hey! to be fair..
i only had the valve issue because of a **** set of the ferrea6000s that had a problem
ferrea replaced them for free but i upgraded to the Competition PLus valves for an extra 60 dollars.

then i never had a problem.

Re:1993 MR2 Turbo - Tuning Stages (dylmrt)

Wed, 17 Oct 2012 11:53:57 GMT

You're right you don't need the valves. I ended up doing it because my original valves were bent, so i changed them anyway.

Re:1993 MR2 Turbo - Tuning Stages (dasic1)

Wed, 17 Oct 2012 11:51:40 GMT

I'm pretty sure the ferrea valve issue is only with their cheaper ones.

Re:1993 MR2 Turbo - Tuning Stages (surok)

Wed, 17 Oct 2012 11:25:11 GMT

my first advice..
do not overcapitalise on the car.

2. GT35R is very fun at 1.7 Bar

Re:1993 MR2 Turbo - Tuning Stages (MR2QIK)

Wed, 17 Oct 2012 09:19:22 GMT

Personally, unless going hardcore (ie 400rwkw+), I don't see the need for oversized valves. Given there's been quite a few documented issues with Ferrea valves I don't see the need to take the risk for a marginal improvement. There are examples of standard valves on 800hp applications (eg MR2Liter in the States).

Re:1993 MR2 Turbo - Tuning Stages (TRD2000)

Wed, 17 Oct 2012 08:08:52 GMT

im not sure that you need to play with valve sizes to achieve 300kw.

longer duration cams with standard lift should do the trick and allow you to run higher boost without problems associated with inlet pressures opening valves. going up in valve size increases the pressure on the valve springs and means they'll degrade faster and start lifting off the cams as high rpm.

i guess you could choose.
do the valves and run lower pressure.... or a turbo that spools quicker but doesn't hold peak pressure at high rpm so is effectively lower.
or,
run a turbo that can produce 20psi at high rpm and increase the opening duration but not the valve size.

the stock gen 2 head and cams are good for 200+ kw @ 14psi and about 6500rpm

Re:1993 MR2 Turbo - Tuning Stages (dylmrt)

Wed, 17 Oct 2012 00:04:15 GMT

This is the way I got my 250rwkw (probably good for ~280rwkw with better cooling):

Staring with a gen3 motor:

Rebuilt motor with CP pistons and Eagle Rods
1mm Oversize Ferrea valves
Garrett GT3076R twin scroll turbo @ 21psi
HKS 264 cams on HKS valve springs
Greddy Pro Spec B II EBC
Apex'i Power FC & Commander Tuned by HITMAN
Berk Technologies Dump pipe
Hi-Tech Mufflers' 3" Exhaust
Apex'i Air Pod
Border top mount intercooler
800cc SARD injectors
Walbro GSS341 fuel pump

If I could do it again, i'd swap the GT3076R with a GTX3071 (still might do this). I'd hit the same power ~250rwkw but it would come on boost earlier and generally have more area under the power curve.

Re:1993 MR2 Turbo - Tuning Stages (MRTurbo)

Tue, 16 Oct 2012 23:19:41 GMT

def the CT26 running out of puff after 6000rpm gets tiring after a while...my next plans are first to get rid of the nugget and bolt on a 'CT20B', some sort of CAMS maybe (N/A ones), do a full seal kit inc. HG on the engine, as it's leaking oil from likely the cam and crank seals. then implement a MAP ECU and AFR and IGN tune it properly... which should keep me happy for a while. :)

Re:1993 MR2 Turbo - Tuning Stages (MR PLOW)

Tue, 16 Oct 2012 19:03:30 GMT

Hey Sredze,
As others mentioned, the Power Primer (http://www.mrcontrols.com/primers/power.htm) is an awesome reference.

I also was given this book (http://books.google.com.au/books/about/Toyota_MR2_Performance_Hp1553.html?id=3k-MwlZpT20C&redir_esc=y)
when I bought mine this year, it talks of staged builds (1-3), covering the whole car including engine. In it "stage 2" stops short of turbo upgrade (except maybe for a CT27 or CT20B), giving you around 200rwkw.
If the book had a "stage 4" it would just be a pic of MR2QIK's car " />

Re:1993 MR2 Turbo - Tuning Stages (blacky83)

Tue, 16 Oct 2012 17:30:42 GMT

What are the limits of the stock intake manifold? Im aware of the uneven distribution, was looking at switching to a sidefeed 3SGE manifold when doing my new cooler piping, as its really cheap, bolt on and meant to flow evenly. Is it worth doing or should I go straight to aftermarket?

Re:1993 MR2 Turbo - Tuning Stages (just_ace)

Tue, 16 Oct 2012 15:00:59 GMT

Road and track (forum sponsors) are in north Ipswich qld. Dunno how close that is to you.

Re:1993 MR2 Turbo - Tuning Stages (s2d4)

Tue, 16 Oct 2012 14:42:49 GMT

Cheers for the info Ace,

You are right, the cars running GTX that I've seen are all on E85..

just_ace

gtx all have anti surge housings which as i understand will contribute slightly to lag

gtx have higher efficiency compared to the gt in the higher boost range, however your limited by whatever fuel your running anyway, they'd go well with E85, but with 98oct as most tend to run max 20psi you can't mak full use of the potential.

this is as i understand it.

Re:1993 MR2 Turbo - Tuning Stages (sredze)

Tue, 16 Oct 2012 12:41:56 GMT

You guys are going fairly deep in all this aren't you. :) I am on the Gold Coast, and am still doing my research as to the workshop(s) that specialize in MR2 Turbos here in QLD. I guess If i was in Syd, I'd be in luck fairly quick.
Currently I am at the bolt-on stage, I would say as I recently got a side-mount intercooler installed and the 3"inch exhaust.

Re:1993 MR2 Turbo - Tuning Stages (MR2QIK)

Tue, 16 Oct 2012 12:15:23 GMT

^ couldn't have summarised it better myself