Tuning the AJP8 engine
Discussion
Joolz said in the last TVR Sprint magazine that'tuning for the AJP8 engine was limited'.
That's probably not an issue for the road as they're not exactly slow, but as they use these engines in the Tuscan racers surely they're not just stock?
What do they do to them to get a decent 450bhp?
That's probably not an issue for the road as they're not exactly slow, but as they use these engines in the Tuscan racers surely they're not just stock?
What do they do to them to get a decent 450bhp?
As far as I'm aware its - ported heads, wilder cam profiles, no cats, reprogrammed ECU, different throttle bodies and injectors, different induction pipes/trumpets and air filters and dry sump lubrication (apparently that can make a big difference to power as the crank isn't thrashing about in churned up oil). Oh, and thats probably about £8000 of work to give you a TVR claimed 469 BHP (for what thats worth) and a powerband you wouldn't want to live with.
Regards
John
Regards
John
well, as the 4.5RR's seem to be pushing out around 400bhp without damaging the power delivery (increasing torque across the range) I cant see why a Tuscan Racer cant get around 450+
What joolz says in the article is that its tuning potential is limited to 100 bhp a litre without major work - turbos etc... which is probably about right, im sure its not too long before we see a Cerb with a real 420bhp (the old Xsocet was said to have 412).
It certainly seems possible to get 450, but what joolz was pointing out was that theres not much more to be had without major work.
Wasnt Zertec working on some 4.5 Engine mods?? Clive any news? - on that point, has anyone successfully got in contact with him for a month or so? WE NEED AFTERBURNERS!!!!!
What joolz says in the article is that its tuning potential is limited to 100 bhp a litre without major work - turbos etc... which is probably about right, im sure its not too long before we see a Cerb with a real 420bhp (the old Xsocet was said to have 412).
It certainly seems possible to get 450, but what joolz was pointing out was that theres not much more to be had without major work.
Wasnt Zertec working on some 4.5 Engine mods?? Clive any news? - on that point, has anyone successfully got in contact with him for a month or so? WE NEED AFTERBURNERS!!!!!
What about light pressure Turbos? If you did not want to run mega boost over 1bar or so then you would not have to totally convert the inners of the AJP should get extra 50-80bhp or so.
Jools reckons a 16V heads would be a good idea if anyone wants to pay for the development costs. I have a 4.2 and would be interested in the above mods if any one has a project ongoing let me know.
Paul
Jools reckons a 16V heads would be a good idea if anyone wants to pay for the development costs. I have a 4.2 and would be interested in the above mods if any one has a project ongoing let me know.
Paul
Turbo charging sounds the way for big power, but surely even this would be at a mega cost.
New exhaust headers to bolt the turbos to, plus the cost of the turbos.
Re-worked heads to drop the compression ratio.
Not to mention all the tubing for inlet manifolds, intercoolers etc, plus an intercooler as well, then finally all the setup work and a revised ECU.
Has anybody considered supercharging?? A single supercharger taking drive from the front of the engine with a single inlet manifold to deliver pressure to the current inlets. I think it would be the more cost effective route.
Probably need a big hole in the bonnet though!!
New exhaust headers to bolt the turbos to, plus the cost of the turbos.
Re-worked heads to drop the compression ratio.
Not to mention all the tubing for inlet manifolds, intercoolers etc, plus an intercooler as well, then finally all the setup work and a revised ECU.
Has anybody considered supercharging?? A single supercharger taking drive from the front of the engine with a single inlet manifold to deliver pressure to the current inlets. I think it would be the more cost effective route.
Probably need a big hole in the bonnet though!!
Nitrous seems to work for the charisma team...shame all that power warps the body into such an ugly shape and fills the interior with garish tat! (sorry, i know its a design excersise)
Joolz whispered once to me about if someone with a wedge of cash and a donor vehicle approached him for development....LP turbo i think you said dincha Joolz??
Roll up,roll up! who's first (dont look at me, im skint!)
Joolz whispered once to me about if someone with a wedge of cash and a donor vehicle approached him for development....LP turbo i think you said dincha Joolz??
Roll up,roll up! who's first (dont look at me, im skint!)
Joolz did say he had a guy interested in Hi Pressure turbo charging, Joolz said costs were going to be upwards of 6K to do. I dont know how far the project has progressed if at all.
The supercharger idea sounds good however modifying the front of the engine may be more expensive than the exhausts.
Paul
The supercharger idea sounds good however modifying the front of the engine may be more expensive than the exhausts.
Paul
davidd said:
joospeed said: and has a 998cc 170bhp self built davrian imp turbo ..
Imps rockWhen I was a boy my dad used to get them as company cars!
Speaking of huge power..Jools, any news on that AJP8 rebuild with the piper cams? It would be really interesting to get some info.
D.
yeah .. going to remove one of the cams which has picked up and needs regrinding again
BUT .. best news is I know who did alot of early cam development for TVR on ajp8 and SP6 engines .. how about one of 5 cam grinds for cerbie V8 from mild road to full race? .. cost around 1700 pounds a pair though .. yikes!
joospeed said:yeah .. going to remove one of the cams which has picked up and needs regrinding again
BUT .. best news is I know who did alot of early cam development for TVR on ajp8 and SP6 engines .. how about one of 5 cam grinds for cerbie V8 from mild road to full race? .. cost around 1700 pounds a pair though .. yikes!
I've got a set of clatter cams on a shelf in the garage [got them as souveniers when the whisper cams went in]. I wonder if they could be reground? Alternatively, I could spend my evenings with a file and some wet and dry and make my own custom profiles for a lot less than £1700
WB
>> Edited by williamball on Friday 21st February 16:42
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