BHP Gains

[dajm1]

Hi all, I've got a 1998 4.5 Cerb with sports exhaust and decats, but a little concerned about the power output, I've read that they can be as low as 330 BHP!!! Whats the best way to get it upto 400BHP, I don't want to spend a fortune getting these horses back as I've got a 400BHP XKR and wanted something a bit more lively

Thanks in advance

Dan

[FarmyardPants]

You need to take it to a tuner such as Raceproved who will look it over, put it on the rollers and discuss it's current state with you with a view to liberating the ponies. Tune/remap will make a huge difference, unless it's been done already, and is highly recommended to get the full fat Cerbera experience

[Gray_101]

If you dont want to spend a fortune, your better off getting it serviced and put it on a dyno and see what its BHP is. You may be surprised

Then go from there.

Short induction pipes and re map is the norm for a 4.5, some big gains have been seen from this

Edited by Gray_101 on Friday 3rd September 23:00

[Byker28i]

So do you know what your bhp is? Is it driving badly?
First thing to do is get it onto a rolling road to discover what it is, preferably from a known person, Charlie at Surrey rolling road, joo ( forget where he is now).
If I'm honest I don't notice the extra 8-10 % I gained as it was quick before and is quick now, but the drivability and experience was greatly enhanced from a mapping session.

[Gazzab]

They can be lower than 330bhp!
Get it to a good indie and get it set up well. Ideally get it to Joolz at Raceproved and get it on the rolling road to see your benchmark. A proper set up will probably unleash 380 - 390 ish I guess. A remap and short induction will take you to 400 + (but will start to cost more £'s).
If you are used to a lardy old XKR then a 380 bhp cerb should feel much more lively than the jag.
If the rest of the car is in order (suspension, tyres, brakes and chassis) then splash the cash I say.

[bobbins]

Gray_101 said:

If you dont want to spend a fortune, your better off getting it serviced and put it on a dyno and see what its BHP is. You may be surprised

Then go from there.

Short induction pipes and re map is the norm for a 4.5, some big gains have been seen from this

Edited by Gray_101 on Friday 3rd September 23:00

He's spot on - do this. Took mine from 350 to over 400 and made it a much smoother drive.

[Gazzab]

A significant amount of the gain can be from moving from a badly set up car to well set up one.

[JensenA]

As others have said, getting the engine set up correctly is critical on the AJP as it's a flat plane crank,unlike your Jag V8 the AJP is basically 2 four cylinder engines bolted together and 'they' need' to be set up correctly and balanced. Have you had the car for long? It takes a while to realise that the old Loud pedal travels about twice as far as any other cars, and it needs pushing all the way down to fly .

[dajm1]

Thanks guys, I'll get it dyno'd asap. Fingers crossed 350+ Sounds like 400's only 1K away

[boss1uk]

Mines a 1999 4.5. exhaust, decat, short induction, service and remap now 416bhp at Austec Crawley....

[Gazzab]

Some dynos are considered generous. The benchmark dynos are charred willies at SRR or Joolz at Raceproved.

[APMAUTO]

Gazzab said:

Some dynos are considered generous. The benchmark dynos are charred willies at SRR or Joolz at Raceproved.

[Gazzab]

And this whole topic is dodgey and what do I know etc....
What you want is a well set up cerb as opposed to bhp chasing which only costs money. But it's fun!

[FUBAR]

Gazzab said:

Some dynos are considered generous. The benchmark dynos are charred willies at SRR or Joolz at Raceproved.

I had my Austec bhp checked at charred willies and the Austec RR was 3bhp more, not the wild differential of some RRs from the distant past. I doubt Raceprove's RR will be bang on SRRs.


And Gaz, have a for charred willies