Lost top end speed with new cams?!? - Engines Forum - Peugeot 306 GTi-6 & Rallye Owners Club

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Subject: Lost top end speed with new cams?!?

astragsi237

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Location: Chatham

Registered: 13 Mar 2009

Posts: 414

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Post #1

Hi all-basically we've had our original cams reprofiled by Kent cams a few weeks back & I took the car out for a spin yesterday on private land to see how it preformed,I've noticed the car now tops out at 131mph where as it use to reach 140mph? Is this right for the cams to loose a bit of power top end? Unsure

Also not 100% sure if they've given much of an improvement either Sad

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Posted 15th Oct 2009 at 01:38

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adam b

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Location: The Nam

Registered: 24 Jan 2006

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Post #2

What have you changed them to, have they been timed properly / mapped etc etc?

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Posted 15th Oct 2009 at 01:46

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rapidcossie

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Location: falkirk

Registered: 30 Jun 2009

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Post #3

what powerband did kent say they were good for?

most cam manufacturers will spec a rev band that the cams will be best at.

for example a rally style cam will be 2-6k and a race style might be 4-8k.

rolling road before and afte r cams is only true way to see what effect they have had on power and power curve

Posted 15th Oct 2009 at 02:21

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phillipm

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Location: Rotherham

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Post #4

Are they timed in right, and have you had the car remapped?

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Posted 15th Oct 2009 at 02:22

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astragsi237

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Location: Chatham

Registered: 13 Mar 2009

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Post #5

Im not 100% sure what spec they reprofiled them to as my mate dealt with them, but they should be a racing spec of some kind!

The car isn't remapped and as far as im aware its timed up correctly, Been drving it for the last 2weeks & the power band starts earlier around 2/2.5k and finishes eariler at about 6.5k

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Phase 1 bianca white GTi-6:SOLD
Phase 2 blaze yellow d-turbo:Off to scrap heaven
Phase 2.5 platinum silver GTi-6:Just purchased :-D

Posted 15th Oct 2009 at 03:20

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phillipm

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Post #6

Well, there's 2 of your problems....

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Posted 15th Oct 2009 at 03:23

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astragsi237

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Location: Chatham

Registered: 13 Mar 2009

Posts: 414

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Post #7

I was under the impression for mild cams you could get away without having a remap or is this essential for all aftermarket cams?

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Phase 1 bianca white GTi-6:SOLD
Phase 2 blaze yellow d-turbo:Off to scrap heaven
Phase 2.5 platinum silver GTi-6:Just purchased :-D

Posted 15th Oct 2009 at 03:26

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rapidcossie

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Post #8

not racing spec if the power band finishes at 6.k.

I also find that you usually need to alter cam timing from standard to get the best from any after market cam.

Posted 15th Oct 2009 at 03:39

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phillipm

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Post #9

See here:

Click

Ninja

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Posted 15th Oct 2009 at 03:35

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astragsi237

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Location: Chatham

Registered: 13 Mar 2009

Posts: 414

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Post #10

rapidcossie wrote:

not racing spec if the power band finishes at 6.k.

I also find that you usually need to alter ign timing from standard to get the best from any after market cam.

could you possible explain further on how to do that or point me in the right direction? Mellow

________________________________________

Phase 1 bianca white GTi-6:SOLD
Phase 2 blaze yellow d-turbo:Off to scrap heaven
Phase 2.5 platinum silver GTi-6:Just purchased :-D

Posted 15th Oct 2009 at 03:35

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rapidcossie

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Registered: 30 Jun 2009

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Post #11

you will NEED to find out what lift and duration the cams have been ground to.

Kent are pretty good to deal with and should be able to help you as they must have sent a spec cheet with the cams.

Most of their cam specs are on their web site if you dont have the sheet but can fid out fromyour mate what kind they are.

you will need vernier pulley to alter cam timing, and this must be done by a good RR operator.

Posted 15th Oct 2009 at 03:42

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astragsi237

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Location: Chatham

Registered: 13 Mar 2009

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Post #12

phillipm wrote:

See here:

Click

Ninja

Hmmmm Just read through that thread & to be honest that was a total waste of 15mins Dry

two sided storys with no definate answer

________________________________________

Phase 1 bianca white GTi-6:SOLD
Phase 2 blaze yellow d-turbo:Off to scrap heaven
Phase 2.5 platinum silver GTi-6:Just purchased :-D

Posted 15th Oct 2009 at 03:54

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phillipm

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Post #13

Dunno, I think you've just proven my point quite nicely, thanks LOL

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Posted 15th Oct 2009 at 03:55

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astragsi237

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Location: Chatham

Registered: 13 Mar 2009

Posts: 414

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Post #14

I can see the point you was getting across more but kent cams said they'd be fine without a remap but then again the car drives like it has turbo lag at the start/gets abit quicker in the middle of the rev range then dies off come 6.5k where as before we could quite happily rev to 7.5k before the power dropped off

________________________________________

Phase 1 bianca white GTi-6:SOLD
Phase 2 blaze yellow d-turbo:Off to scrap heaven
Phase 2.5 platinum silver GTi-6:Just purchased :-D

Posted 15th Oct 2009 at 04:01

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welshpug!

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Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #15

sounds like the cam timing was a bit retarded anyway if it revved all the way to the limiter without slowing down at all, mine with an advanced inlet cam (standard) doesn't like to pull past 6600 in 4th, shift to 5th then though and it'll keep on pulling round to 6600 again.

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Posted 15th Oct 2009 at 05:10

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