Tuning for S1 Exige

[slatess1]

Good Morning,

Quick tuning question for you chaps regarding my S1 Exige. Myself and a friend (who owns the type 25 S2 Elise) visited a Lotus Specialist to enquire about possible bhp / torque upgrades. It was mentioned that the S2 Elise would benefit from porting and polished cylinder heads.

Does my Exige have this already as standard or would i need this to be upgraded?

Also any other upgrades you can think of (excl sc or turbo's) would be much appreciated for both mine and my friends S2. I was thinking about pulleys, de-cat pipe and emerald ecu remap for mine???

Any feedback would be much appreciated

[shangani]

S1 exige already has the vhpd engine. Generally the earlier ones were 177 bhp, but could be brought up to 190 easily. Much beyond that involves a lot more work. The head already breathes well.

I suggest contacting Dave Andrews who knows about as much as anyone should know about options for the k series. www.dvapower.co.uk/

[S Works]

For the S2 it depends on the current engine configuration. If it's standard, getting a 135 head, a 4-2-1, good exhaust and induction will see the bhp figure rise up into the 140's probably, with good torque increases to boot.

With the Exige as shangani says, you'll need to talk to someone experienced at tuning the K-series, of which DVA is renowned as being one of the best.

www.exiges.com is a good resource - have you joined yet?

[richquy]

Hi there

I'm the owner of the T25 - it's the 111s version, already have jap-import exhaust (someone finally managed to identify it for me) and induction kit, but I presume the 4-2-1, porting and polishing and maybe a de-cat would be a good bet for both BHP and torque improvement?

Anyone heard that a de-cat on the VVC can reduce bhp due to lack of back-pressure required??

Intend on speaking to DVA Power when I get the chance, but just wanted people's opinions before doing so.

Thanks

[S Works]

Talk to DVA - anything he doesn't know about the K isn't really worth knowing.

Regarding CRP, I think you're right - again defer to DVA for advice.

[eddieb28]

I have got an S1 111s and have recently had a Piper manifold and eliseparts back box fitted to it aswel as a hurricane CAI. I understand the power does not increase if the CAT is removed as this engine needs some back pressure as you said. I noticed a big difference in mid range and overall power after fitting the 4-2-1 and back box. Def worth it.

[cej]

the peak power will always increase if you have less backpressure.

But,you will lose some torque down low,which is what you'll notice, so the car will feel slower.

But just get a high flow cat instead. I have dynoed several cars and it'll only lose 1-2hp or so with a good high flow cat. And then it'll be emission legal

[Paul RN]

Surprised no ones mentioned a honda or audi engine convertion for both. 200bhp + with a stable engine.