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Heard back from who? Do you monitor the AFR yourself while driving (have you got a wideband fitted)? The AEM Uego doesn't read any lower/richer then 10:1! Justin from Prime in the U.S. They're the guys who have done hundreds of gen 4 conversions over there, so they know their stuff. I run a wideban...

Just heard back, 10:1 afr on a gen 4 is perfect :thumleft: Heard back from who? Do you monitor the AFR yourself while driving (have you got a wideband fitted)? The AEM Uego doesn't read any lower/richer then 10:1! Justin from Prime in the U.S. They're the guys who have done hundreds of gen 4 conver...

Just heard back, 10:1 afr on a gen 4 is perfect

Don't know too much about the mapping side of them yet, just most A/F graphs I've seen stop around 10:1 at that end of the scale. Maybe it just opens the taps higher up the revs? Pretty sure I get 10:1 at WOT and full boost (whatever that is set to) which could be as low as 3500rpm from memory, may...

10:1 is normal from what I've been told, not ideal for power but keeps combustion temps down. I guess for a broad map. Incidentally, it's 10:1 at Spring pressure and 1 bar also. That said I might chuck Justin an email just to make sure that's what they're seeing too. I'll ask the same question as fa...

My rev 4 engine is running a very modest 1.39 bars of boost and I'm getting 400whp or at fly 445.3 bhp 399lb... been on track and road for over 4 years now...so far I have been happy with it apart from throwing lots of gold brick at it you got to have pocket full of gold. If you are a power junkie....

that'll be 330 USAWHP then.. :whistle: Prime made 327 wheel horsepower and 267 lb ft of torque at 17psi on an unopened Prime GEN4 swap with Prime 3" intake, Prime 3" downpipe, Berk 3" exhaust, and Prime 2.5" intercooler kit. This was on 93 octane pump gas and stock ECU. No piggy...

I've been perfectly happy running mine, albeit with a ct15, for 2 years at up to 19.5 psi (fuel cut is at 22psi), my AFR's at WOT are 10:1 on the dot and never fluctuate. In recent years, certainly since I became interested in the Gen 4, Prime have been happily building Gen 4's at ~330whp with the ...

Rev 3 stock will run more if you don't go forge. Rods are stronger but only 350bhp is limit I believe Gen2/3 rods have been proven to handle 700+whp. The only reason you replace them in a forged build is if you want something lighter that is just as strong. You may be right on the Gen 3 rods, but t...

I've been perfectly happy running mine, albeit with a ct15, for 2 years at up to 19.5 psi (fuel cut is at 22psi), my AFR's at WOT are 10:1 on the dot and never fluctuate. In recent years, certainly since I became interested in the Gen 4, Prime have been happily building Gen 4's at ~330whp with the s...

It might be worth speaking to these guys in the States: MadWorks_SW20@yahoo.com They do a lot of "Gen 4" Caldina swaps into USDM MR2s, which never got past the "Gen 2" 3S-GTE. I don't know them personally but I'm aware of them and the fact they specialise in dropping these engin...

Pretty sure the early Rev 3 Gen 3's had weaker blocks and people have confirmed the difference between the Rev 4 Gen 3 block and the Rev 3 Gen 3. A very well known mr2 specialist has confirmed the difference between my Gen 4 block and the Rev 3 Gen 3 he had sat next to it. Owning a Gen 4 and speaki...

Pretty sure the early Rev 3 Gen 3's had weaker blocks and people have confirmed the difference between the Rev 4 Gen 3 block and the Rev 3 Gen 3. A very well known mr2 specialist has confirmed the difference between my Gen 4 block and the Rev 3 Gen 3 he had sat next to it. Owning a Gen 4 and speakin...

I had a c20b hybrid turbo 364bhp on 1.35 bars but it was very laggy as I was aiming for high bhp full boost started at 4.5 revs and ran very rough then remapped it for better idle and to get full boost start at 3 revs but power was down to 312bhp tho... stock set up. But forged is the way really. R...

I had a c20b hybrid turbo 364bhp on 1.35 bars but it was very laggy as I was aiming for high bhp full boost started at 4.5 revs and ran very rough then remapped it for better idle and to get full boost start at 3 revs but power was down to 312bhp tho... stock set up. But forged is the way really. R...

:shock: thanks folks for clearing it all up for me....I looked it up previously and over all a twin scroll charger (eg rev3) has been proven to be more responsive and have a better power curve than a single scroll (eg rev4) charger but really all I wanted was a car that would be a little different ...

I never got why people don't go for the rev4 or even 5 3sgte as surely they are the most advanced with the least issues. I always wondered why everyone ranted and raved about the rev 3.... The gen 5 has a centre feed manifold just like the Rev 3. The benefit of the gen 4 is its better side feed inl...

Al-sw20 wrote:You would want to replace the manifold before it warps, like they all seem to.

Lol @ the turbo being better than the ct20b.

Ok so the ct20b is better than the more modern ct15 according to you, so therefore you must agree then that the Gen 4 is the better engine in that case?!

I never got why people don't go for the rev4 or even 5 3sgte as surely they are the most advanced with the least issues. I always wondered why everyone ranted and raved about the rev 3.... The limitations imposed by the one piece turbo/exhaust manifold would be my guess. The 3rd generation also has...

The downside to the Caldina engine is the toothpick rods. Makes the car rev happier than previous generations, no where near as tough. If you're concerned about the rods, swap them for forged. Not that expensive to do and then you really do have an awesome setup for power. Otherwise run 300 all day...