Janspeed manifold fitted - surprising result

[stamford]

Your figures show the manis give slightly more torque than standard but the power is down by comparison to mine. Would be interesting to see the same results with the de-cat fitted. Just shows there are difference between these engines and what eh ecu can 'find' before mapping.

Main thing is you are happy, you'll notice a difference when on track, the top end AFR will have improved and it will be willing to go.

[mattyprice4004]

I'd also be interested to see if a decat makes a difference - there's a lot of people who believe back-pressure is needed on the KV6, and also a lot who believe a decat does make a positive difference.
Only one way to find out...

[dave23572]

Yes a de-cat would be interesting, I suspect would make some difference.

Trouble is I want to stay legal and can't be bothered with putting a cat back on for every MOT. Otherwise I'd have gone that way, it's cheaper than a sports-cat to boot!

[talkingcars]

As long as the bolts aren't rusted it is quick to swap a cat out (5 bolts and the lambda probe).

Having the near standard exhaust should provide the back pressure a NASP engine needs.

I wonder if the difference between this and Stamfords is down to who did the remap.

[Stephen]

Well mine is same spec as yours. Janspeed manifolds and sports cat. ITG induction and then stainless duplex back. Remap and cams is next on the cards to see what can be done. I recon il be close to the 200 aswell if not above with cams.

[dave23572]

Originally Posted by talkingcars

As long as the bolts aren't rusted it is quick to swap a cat out (5 bolts and the lambda probe).

Having the near standard exhaust should provide the back pressure a NASP engine needs.

I wonder if the difference between this and Stamfords is down to who did the remap.

Stamford has standard manifolds but a de-cat.
So I have better manifolds, but a more restrictive cat.
I suspect though the de-cat is probably worth more than Janspeed manifolds on a sports cat, That's why Stamford is about 4-5BHP higher than mine.

[dave23572]

I've only just noticed that my high-res dyno graph attachments were re-sized to be unreadable. This forum doesn't seem to allow high-res images unfortunately.

If anyone wants to see them, PM me your e-mail address.

Dave

[ZS Phil]

To upload a decent quality picture you can upload the picture to photobucket for free. Once it is on photobucket, you can copy the [IMG] link produced by photobucket and copy that into your post on here. The picture will then automatically show up in your post.

Here is a how to: http://www.themgzs.co.uk/vb/showthread.php?t=104

[dave23572]

High res versions of my Dyno graphs linked from my website:-


"Before"
http://www.dhcomputing.co.uk/images/...ept%202014.png

"after mods" & "two re-map runs""
http://www.dhcomputing.co.uk/images/...Nov%202014.png

[Quadcam24]

decat is worth 5 bhp, sie rollered his car before and after with a de cat and it made 5 bhp, they rev out more eagerly with a de cat.
Matt had full exhaust inc manifolds and good induction and it made 190 bhp.
I think i was the first to fit a de cat and i could tell instantly the car was perkier, this was with standard cat back system.
i later added a cat back system and i couldn't tell a difference at all, later again i added hayward and scott manifolds and that gave instant noticeable gains like the de cat.