AJP 4.2 upgrade?

AJP 4.2 upgrade?

Author
Discussion

thomas.moeller

Original Poster:

97 posts

211 months

Sunday 26th March 2017
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Hi,

I got a Cerbera 4.2 and I would like to get a bit more power. What option do I have, who can do it (not many TVR tuners left i guess) and how much does it cost?

Hope you can help.

/ Tom

Jhonno

5,762 posts

140 months

Sunday 26th March 2017
quotequote all
ACT Performance manifolds
Decat
Clean injectors
Flow your throttle bodies
Remap

ukkid35

6,138 posts

172 months

Sunday 26th March 2017
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If you think the car is down on power, make sure everything is working properly first before considering an upgrade.

Dan has nailed it as usual, bar one omission - valve clearances.

gruffalo

7,509 posts

225 months

Sunday 26th March 2017
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There are options, drop me a PM if you want a chat, talking so much better than text!

thomas.moeller

Original Poster:

97 posts

211 months

Monday 27th March 2017
quotequote all
Thanks, for your feedback. You are right the engine may have lost some of the original "puff" which could be regained as suggested. How much power would you think I could gain by following your suggestion and where to buy? I'm looking for something in addition to the original 360BHP. More in line of +450BHP.

TA14

12,722 posts

257 months

Monday 27th March 2017
quotequote all
thomas.moeller said:
Thanks, for your feedback. You are right the engine may have lost some of the original "puff" which could be regained as suggested. How much power would you think I could gain by following your suggestion and where to buy? I'm looking for something in addition to the original 360BHP. More in line of +450BHP.
For that sort of power I think you'll need a 4.7 http://www.apmtvrservicing.co.uk/

Jhonno

5,762 posts

140 months

Monday 27th March 2017
quotequote all
thomas.moeller said:
Thanks, for your feedback. You are right the engine may have lost some of the original "puff" which could be regained as suggested. How much power would you think I could gain by following your suggestion and where to buy? I'm looking for something in addition to the original 360BHP. More in line of +450BHP.
For that kind of power, 4.7 and deep wallets.. Although recent 4.7's haven't made the expected power.


Edited by Jhonno on Monday 27th March 08:22

thomas.moeller

Original Poster:

97 posts

211 months

Monday 27th March 2017
quotequote all
Jhonno said:
ACT Performance manifolds
Decat
Clean injectors
Flow your throttle bodies
Remap
Howmuch power would you get from above? Where is the best place to it done?


Jhonno

5,762 posts

140 months

Monday 27th March 2017
quotequote all
thomas.moeller said:
Jhonno said:
ACT Performance manifolds
Decat
Clean injectors
Flow your throttle bodies
Remap
Howmuch power would you get from above? Where is the best place to it done?
Depending on how healthy your engine was to begin with you could end up with just shy of 400bhp, your injectors will be running out there though.

Joolz at Kits and Classics can flow your throttle bodies http://www.kitsandclassics.co.uk/
ACT for the manifolds (obviously)
Injector tune for cleaning your injectors
Joolz again for your remap.
Decats I think ACT do them.

You could just give the car to Joolz and pick it up after with it all done I would imagine. Or someone like Andy @APM or Dom @Powers

As with all things, the cost will be a lot more paying for someone else's labour.

Byker28i

58,831 posts

216 months

Monday 27th March 2017
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thomas.moeller said:
Thanks, for your feedback. You are right the engine may have lost some of the original "puff" which could be regained as suggested. How much power would you think I could gain by following your suggestion and where to buy? I'm looking for something in addition to the original 360BHP. More in line of +450BHP.
Yeah that isn't going to happen from a 4.2. The original was a claimed 350bhp, mine used to be 341-343bhp depending on etster.

Mines probably the best 4.2 out there with everything done as suggested above, except its got the ACT quiet exhaust system, I could possibly release a few more horse with a 3" bore system but I like it quieter.

So mine has 380bhp, BUT and the big but, why more power? Pub talk?
Mine does 0-60 in 4 secs, has pulled a standing start to a mile in 31 secs and has traveled at close to 190mph. Thats pretty fast and just adding another 20-40 bhp doesn't make it faster, it's fractions at this point and all comes down to the driver reaction time (as seen at fighting torque).

Weight? Some of the cars (and drivers) are heavy. The front seats weigh a lot, perhaps a weight loss program. There's not much to go on though.

Other than that it's engine change time and thats big bucks. Anyone got a graph of a 4.7 at Surrey Rolling road? I think the old shootouts we had there the good, sorted 4.5's made just over 420bhp.

Thats why some have gone the LS engine route



Incognegro

1,560 posts

132 months

Monday 27th March 2017
quotequote all
thomas.moeller said:
Thanks, for your feedback. You are right the engine may have lost some of the original "puff" which could be regained as suggested. How much power would you think I could gain by following your suggestion and where to buy? I'm looking for something in addition to the original 360BHP. More in line of +450BHP.
Dare I say it being an S6 owner but for the Power gain you would like it does seem that a rebuild would be the way to go, especially if its lost original "puff" that could spell a bigger problem. The 4.2 to 4.5 seems like a common one for Powers Performance but there is also the 4.7 (others know much more than me).

If cost and 'engine' brand is not a problem to you then an LS3 may be your choice as it will get you close if not the full 450bhp upon standard installation.

thomas.moeller

Original Poster:

97 posts

211 months

Monday 27th March 2017
quotequote all
Byker28i said:
Yeah that isn't going to happen from a 4.2. The original was a claimed 350bhp, mine used to be 341-343bhp depending on etster.

Mines probably the best 4.2 out there with everything done as suggested above, except its got the ACT quiet exhaust system, I could possibly release a few more horse with a 3" bore system but I like it quieter.

So mine has 380bhp, BUT and the big but, why more power? Pub talk?
Mine does 0-60 in 4 secs, has pulled a standing start to a mile in 31 secs and has traveled at close to 190mph. Thats pretty fast and just adding another 20-40 bhp doesn't make it faster, it's fractions at this point and all comes down to the driver reaction time (as seen at fighting torque).

Weight? Some of the cars (and drivers) are heavy. The front seats weigh a lot, perhaps a weight loss program. There's not much to go on though.

Other than that it's engine change time and thats big bucks. Anyone got a graph of a 4.7 at Surrey Rolling road? I think the old shootouts we had there the good, sorted 4.5's made just over 420bhp.

Thats why some have gone the LS engine route
Thanks for this reply. Your are so right and your reply make so much sense bow

........but my brain go "ohhhh no" and don't take it in. I'm a Pistonhead and proud of it rolleyes

Of cause more power is better (we all know) and you also went through alot to get 20-40BHP smile

The question is which is better the path to get increased power. Would it make more sense to go 4.2 -> 4.5 (maybe Red Rose) or is it the way you went which is the best.

If you could do it all again would you go for more engine volume?

Are anyone doing Red Rose anymore and how far would that get you?


Edited by thomas.moeller on Monday 27th March 13:45

thomas.moeller

Original Poster:

97 posts

211 months

Monday 27th March 2017
quotequote all
Incognegro said:
Dare I say it being an S6 owner but for the Power gain you would like it does seem that a rebuild would be the way to go, especially if its lost original "puff" that could spell a bigger problem. The 4.2 to 4.5 seems like a common one for Powers Performance but there is also the 4.7 (others know much more than me).

If cost and 'engine' brand is not a problem to you then an LS3 may be your choice as it will get you close if not the full 450bhp upon standard installation.
This could have been a great solution but, I need to a pre-1997 engine due to taxes (don't ask. This is just one of the things you have to accept when living in a car hostile country). Actually this is the reason why I did not buy a 4.5 to begin with.

ATG

20,485 posts

271 months

Monday 27th March 2017
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Given no one has suggested it yet, I'm guessing forced induction isn't a good option?

Jhonno

5,762 posts

140 months

Monday 27th March 2017
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ATG said:
Given no one has suggested it yet, I'm guessing forced induction isn't a good option?
Possible, but expensive and a huge undertaking on an AJP it seems.

Thekraken

91 posts

99 months

Monday 27th March 2017
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4.2s Are as standard a great set up.....well mapped and very rev responsive......if yours isn't.....go in search of the lost ponies.....prime candidate as has been previously mentioned is valve clearances, Poor set up and getting the injectors cleaned......

Having gone this route the injectors made such a huge difference on mine......like a different car!!!!

Chasing further BHP.....you can and why not ....but it will be big money ........


Jhonno

5,762 posts

140 months

Monday 27th March 2017
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Lighter flywheel is a good mod also.

Thekraken

91 posts

99 months

Monday 27th March 2017
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Ooooo lightened fly wheel!!! Next time clutch or slave needs doing!!!!!

ukkid35

6,138 posts

172 months

Monday 27th March 2017
quotequote all
Jhonno said:
Lighter flywheel is a good mod also.
Not entirely convinced.

The engine has so little rotating mass anyway that a lightened flywheel is probably going to encourage stalling more that it will increase responsiveness.

Willing to be proven wrong.

Tanguero

4,535 posts

200 months

Monday 27th March 2017
quotequote all
Byker28i said:
Anyone got a graph of a 4.7 at Surrey Rolling road?
Yes frown

4.7 (including billet crank & 2 cam shafts) = £14.2k inc VAT!!!)
After remapping by Joolz