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Will an STi V7 engine fit the v3?
Can any one help I have an STiV3 with a blown engine, and have been offered a V7 engine at a reasonable price complete with turbo etc, has any one done this before or knows what extra work would be involved if any fitting this engine, including wiring etc
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Originally Posted by nuts4cars
Can any one help I have an STiV3 with a blown engine, and have been offered a V7 engine at a reasonable price complete with turbo etc, has any one done this before or knows what extra work would be involved if any fitting this engine, including wiring etc
David APi Engines / APi Impreza |
Agreed... Deffo not as simple as bolting straight in.
Buy the Ver 7 engine, if it is that cheap... sell it on and buy a recon one from the guy above with the money Rob |
Thanks Guys
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why not......
hi m8
why not buy the engine and fit your heads and bits and bobs to it? that way you would have a very strong engine! the 7s and 8s are strong, is it a sti? you could then sell all the bits that were left over! jvs in edinburgh www.powervehicles.com have just done this with one of davids engines! cheers robin. |
Its an AVCS v non-AVCS engine, you need much more than just the engine to get it to work, id find another phase1 STi engine (v3 again) or have the engine rebuilt.
Tony |
Originally Posted by robinH20MRV
hi m8
why not buy the engine and fit your heads and bits and bobs to it? that way you would have a very strong engine! the 7s and 8s are strong, is it a sti? you could then sell all the bits that were left over! jvs in edinburgh www.powervehicles.com have just done this with one of davids engines! cheers robin. The piston crown shape on V7 is not really compatible with the cylinder head 'squish' shape of the v3. lt'll work; but can /might cause hot spots in the burn area that might increase the chance of detonation. Ideally a decent remap should sort out that issue, but it might still be a problem area. There is a similar problem waiting to jump out and bite people using the 2.5 EJ257 short motor in early WRX's - I have heard one or two horror stories from reliable sources re. the exact issue above. Good luck David APi Engines / APi Impreza. PS, l like TweenieRob's idea best :D |
It can be done because we have done it ;) Everthing mechanical bolts up but the fun is in the wiring. You will also need the engine loom from the version 7 and the ECU. additionally you will have to make a loom from the ECU to the Engine loom connector.
Alternatively, remove the AVCS of the version 7 engine and use fixed position WRX cam gears and block up the oil feed holes that feed the AVCS solenoids that you wont need. :D Conrad |
Originally Posted by Conrad_Bradley
It can be done because we have done it ;) Everthing mechanical bolts up but the fun is in the wiring. You will also need the engine loom from the version 7 and the ECU. additionally you will have to make a loom from the ECU to the Engine loom connector.
Alternatively, remove the AVCS of the version 7 engine and use fixed position WRX cam gears and block up the oil feed holes that feed the AVCS solenoids that you wont need. :D Conrad David APi Engines / APi Impreza |
Conrad, i like the way you say 'we' have done it... we as in who exactly?
Alternatively, remove the AVCS of the version 7 engine and use fixed position WRX cam gears and block up the oil feed holes that feed the AVCS solenoids that you wont need I would much rather spend 5k to fit a ver 7 engine than just get a replacement from the likes of David @ API :rolleyes: Rob I do disagree with the 257 stuff though, rework of the phase one heads works very well on the engines i have done. |
[QUOTE=tweenierob]Conrad, i like the way you say 'we' have done it... we as in who exactly?
Dont you mean and then get the heads worked to run the early manifold? or did you forget about the idle control system and TPS? :) Oh yeah and then get the manifold lenghthened to fit the heads... :D I would much rather spend 5k to fit a ver 7 engine than just get a replacement from the likes of David @ API :rolleyes: Rob I do disagree with the 257 stuff though, rework of the phase one heads works very well on the engines i have done.[/QUOTE] Rob, The problem is that people are trying to just bolt early heads on as-is. Also YHPM. David APi Engines / APi Impreza |
Originally Posted by tweenierob
Conrad, i like the way you say 'we' have done it... we as in who exactly?
Dont you mean and then get the heads worked to run the early manifold? or did you forget about the idle control system and TPS? :) Oh yeah and then get the manifold lenghthened to fit the heads... :D I would much rather spend 5k to fit a ver 7 engine than just get a replacement from the likes of David @ API :rolleyes: Rob I do disagree with the 257 stuff though, rework of the phase one heads works very well on the engines i have done. Conrad, i like the way you say 'we' have done it... we as in who exactly? Dont you mean and then get the heads worked to run the early manifold? or did you forget about the idle control system and TPS? :) Oh yeah and then get the manifold lenghthened to fit the heads... :D I would much rather spend 5k to fit a ver 7 engine than just get a replacement from the likes of David @ API :rolleyes: |
Dont take this the wrong way Conrad...
Please read your words carefully :D And i quote Ahem cough lol Everthing mechanical bolts up but the fun is in the wiring. You will also need the engine loom from the version 7 and the ECU. additionally you will have to make a loom from the ECU to the Engine loom connector. Alternatively, remove the AVCS of the version 7 engine and use fixed position WRX cam gears and block up the oil feed holes that feed the AVCS solenoids that you wont need Everything mechanically bolts up, engine loom needed to then chassis Loom. Alternatively, scrap the AVCS and you wont need the above ie. engine loom etc. So, i wondered how you would control the ver 7 idle valve with the early ecu, where the ecu would take it tps closed signal from, tps wiring in fact... Apologies if i alone read it like that :D Also, IMHO it would take approx 5k for someone to retro fit a ver 7 engine to a early car (inc supply), it is approx £1800 for an engine from API and say £500 to fit (i am cheaper ;) ) A much better option IMHO. The tone of your post made it sound like it was easy 'look at me i have done it' etc. I am very tired and may need to take back some of this in the morning lol Rob :) |
Originally Posted by tweenierob
Dont take this the wrong way Conrad...
Please read your words carefully :D And i quote Ahem cough lol I and others (most likely) read this as... Everything mechanically bolts up, engine loom needed to then chassis Loom. Alternatively, scrap the AVCS and you wont need the above ie. engine loom etc. So, i wondered how you would control the ver 7 idle valve with the early ecu, where the ecu would take it tps closed signal from, tps wiring in fact... Apologies if i alone read it like that :D Also, IMHO it would take approx 5k for someone to retro fit a ver 7 engine to a early car (inc supply), it is approx £1800 for an engine from API and say £500 to fit (i am cheaper ;) ) A much better option IMHO. The tone of your post made it sound like it was easy 'look at me i have done it' etc. I am very tired and may need to take back some of this in the morning lol Rob :) Apologies if it read like that (with a tone) but I did say later I wouldnt want to do it again, not without being paid lots anyway. What I was trying to say was that if you dont want the AVCS use the fixed position WRX cam gears, block the oil feed lines to the AVCS solenoids up BUT you will still need all the version 7 wiring and inlet manifold sensors, ECU etc for the easiest Version 7 solution :) |
hi calum!
hi m8,
i was looking at your car today!! its coming on nice!! see you soon if you get a pass off your island!! :) cheers robin. |
OOps...
Rob |
Originally Posted by APIDavid
Good idea but not without some reservations;
The piston crown shape on V7 is not really compatible with the cylinder head 'squish' shape of the v3. lt'll work; but can /might cause hot spots in the burn area that might increase the chance of detonation. Ideally a decent remap should sort out that issue, but it might still be a problem area. There is a similar problem waiting to jump out and bite people using the 2.5 EJ257 short motor in early WRX's - I have heard one or two horror stories from reliable sources re. the exact issue above. Good luck David APi Engines / APi Impreza. PS, l like TweenieRob's idea best :D So far I have been able to test two different setups, one is an STi ver 7 shorblock (EJ207) with STi ver 4 RA heads and parts ..... we used the stock STI ver 4 RA thick headgasket which resulted in a tad less than 8:1 CR. This engine is used with rather high boost and performs very well. The other setup is a STi ver 8 shortblock with STI ver 8 headgaskets with STi ver 4 RA heads, this resulted in 8.5:1 CR (aprox.) and it is used on a rally car, so dunno if it is the race gas, but it performs quite well, no extra det can be felt when compared to the 9:1 CR we used before. Carlos H. |
I have removed my posts from this thread, I have spoken to Conrad and we have settled our differences, I am happy with the outcome.
Callum W |
Lets hope the damage hasn't already been done....
Rob |
Originally Posted by carlos_hiraoka
David,
So far I have been able to test two different setups, one is an STi ver 7 shorblock (EJ207) with STi ver 4 RA heads and parts ..... we used the stock STI ver 4 RA thick headgasket which resulted in a tad less than 8:1 CR. This engine is used with rather high boost and performs very well. The other setup is a STi ver 8 shortblock with STI ver 8 headgaskets with STi ver 4 RA heads, this resulted in 8.5:1 CR (aprox.) and it is used on a rally car, so dunno if it is the race gas, but it performs quite well, no extra det can be felt when compared to the 9:1 CR we used before. Carlos H. I seem to remember that there was some strange mod that Prodrive did on the squish area of their cars around this time to alleviate some of this problem. In fact a machine shop guy in our village has a mandril or template on how to do it. No use on a road car because the competition engines work through a restrictor for the turbo and almost nothing is any use because of the low RPM's. But it's nice to know there is consensus of opinion rather than being a lonely voice in the wilderness. Nice to hear peace has broken out in this thread too !! Good luck all David API Engines / APi Impreza |
As Callum posted, its sorted. :)
Just like to thank David for the assistance given to Callum and myself :) |
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