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Moderators: IMOC Moderators, IMOC Committee Members
C35Rob wrote:MR2Kyle wrote: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.
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The gen 5 has a centre feed manifold just like the Rev 3.The benefit of the gen 4 is its better side feed inlet manifold and coil on plug ignition
- both things can be retrofitted to a gen 3
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The benefits of the gen 3 is stronger stock rods, separate turbo/manifold and plug and play ECU options.In the grand scheme of things it doesn't really matter whether you go with gen 3 or gen 4, both have their pros and cons, I certainly wouldn't pull a healthy gen 3 motor out to replace it with a Gen 4.
They're popular in the states because they never got the gen 3 in an mr2, and gen 3's are older and thinner on the ground so it makes sense to import front cuts from scrapped Caldinas for conversions.
If you had an NA or a dead turbo and had the option of gen 3 or gen 4 for similar money AND you didn't plan on much more than bolt on mods then the gen 4 is a better bet.But if you're going for a big power build, there really is no difference.
MR2Kyle wrote:![]()
thanks folks for clearing it all up for me.
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.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 and giving it starts off with around 250ish standard I'm happy out!
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thanks for all the replies! And the member that's in New Zealand could you tell me what are the common problems on the cardinals just so I know what to look out for
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other than the usual oil leak
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QUOC2008 wrote: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..
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stock set up.
But forged is the way really.
Revision 1,2,3 have weak blocks compared to the rev 4 so don't bore them to fit over size pistons it will crack.
If I was you stick to stock and boost it a bit to300- 350bhp with a few supporting mods the apexi ecu plus commander with a apexi boost controller on a rev3 or rev4 engine with ct20 turbo will be more then enough power.
QUOC2008 wrote: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..
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stock set up.
But forged is the way really.
Revision 1,2,3 have weak blocks compared to the rev 4 so don't bore them to fit over size pistons it will crack.
If I was you stick to stock and boost it a bit to300- 350bhp with a few supporting mods the apexi ecu plus commander with a apexi boost controller on a rev3 or rev4 engine with ct20 turbo will be more then enough power.
sinjen wrote:
I'm so confused! Do you mean Gen 3/4 or the Gen 3 engine in the rev3 and Rev 4? I only ask because the block was reinforced on the Rev 4 Gen 3.
kirk wrote:sinjen wrote:
I'm so confused! Do you mean Gen 3/4 or the Gen 3 engine in the rev3 and Rev 4? I only ask because the block was reinforced on the Rev 4 Gen 3.
Taking this slightly off topic, if there any actual proof to this or is it word of mouth and what people say?
sinjen wrote: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.
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Owning a Gen 4 and speaking to those who actually know, I know which I'd rather build for power.![]()
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Odin_S wrote:sinjen wrote: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.
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Owning a Gen 4 and speaking to those who actually know, I know which I'd rather build for power.![]()
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Some may say you would say that Sinjen![]()
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of course everyone thinks theirs is the best.
All I'll say it i had mine built properly so I'll be very surprised if it does crack
(famous last words
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JD wrote:It might be worth speaking to these guys in the States: [email protected]
They do a lot of"Gen 4" Caldina swaps into USDM MR2s, which never got past the
"Gen 2" 3S-GTE.
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I don't know them personally but I'm aware of them and the fact they specialise in dropping these engines into S-dubya-twennys.
QUOC2008 wrote:
Rev 3 stock will run more if you don't go forge.
Rods are stronger but only 350bhp is limit I believe
sinjen wrote: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 sweet 16 turbo with no issues at all.
As said before, if you mess with any engine without making sure your AFR's are solid you're asking for trouble, as a few of the early swap people found out when they just wound up the boost to maximum.
Just to note, a stock Gen 3 would be pushing the limits at 330whp.![]()
Justin over at prime has all the figures of what they've done(and I know he has a vested interest) and he's an approachable chap so just send him an email.
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Personally, I can't wait to forge the innards and then really take advantage of the Head, ignition, block etc.But as a stock 300-350bhp mr2, the Gen 4 is an absolute peach.
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