cr500dom

I too have been asked to contact you about this by another 7 owner who is coming up your way next weekend. could you let me have a contact number please ? cheers Dom

Are these still available ?

Just a recomendation for these, they are fantastic TB`s with virtually no restriction at Wide open Throttle, due to the shaftless design. Filter back plate or airbox gets trapped between the ram pipe and extension tube as well, so a nice clean installation.

cheaper to sell it and buy a duratec powered car if thats what you want ? Or speak to stuart at Premier power about a 175 conversion ? What are you trying to acheive ?

Peiro is good, Stuart (PP) is good, and scholar are good, personally as they built it I`d be going back and discussing options with Alan at Scholar.

No But Aerocoat a little further afield do a very good job. Or speak to Luke Stevens at Team Leos Motorsport near newmarket, he will know who to use locally ?

@Barkalarr these have got your name on them :D

Every engine is different, Id want to try a selection of different lengths on the dyno to get the optimum. Port design and cam timing will have a bearing on what will work, too many variables without running a proper 1D simulation to get somewhere close. Dave Walker (emerald) has adjustable length trumpets available, might be worth seeing if he does a set to suit your Bodies ? As for throttle plate position, very often this is driven by packaging rather than what is optimum for the particular engine. Also the Jenvey pattern tooling and casting process is somewhat modular, which often drives the spindle position.

You can fit a Metric Cage to an imperial chassis, but not the other way round.

Some engines just dont need big throttles, The sigma, we did an oval blade with an effective diameter of 42mm, which is fine for over 200hp We built a set at 45mm for testing with a customer who was convinced they were strangling the motor at the top end. It made no more power but lost torque everywhere else with teh larger throttles. What made a much bigger difference was intake length, both on top end power and lower end torque. Most ITB systems, even on 16V engines have intake lengths that are really too short. My Sigma set of direct to head throttles have something like 180-190mm trumpet length behind the butterfly and my Zetec (On jenvey dcoe bodies as thats what was fitted) has probably 150mm post butterfly but has a longer intake tract because of the manifold. This makes good power with only cams and rod bolts on a std Blacktop crate motor at 205hp but has 160lbs/ft of torque too with a really nice fat curve.

Higher port velocity means greater cylinder filling in most situations, it would always be my preference to increase rather than decrease port velocities. It also helps with fuel mixing and tumble. Butterfly closer to the head is better for transient response and drivability, this is difficult with a traditional DCOE style body because of the manifold required. Direct to head allows you to position the butterfly much closer than a DCOE style. 50's on a 2.0L sounds like a serious motor ? 9000rpm ? and 250+ hp ?

I painted my floor with Epoxy in White, shows some marks but is so much brighter in there, much easier to see when something gets dropped etc

A number of years designing engines and induction systems including Throttle bodies means I stand by what I said regarding throttle position. M-Bob, If you already have the Bodies then that's different. The theory says you lose port velocity with a bigger diameter, (Which was always more of an issue with carbs) in practice its less of an issue. I`d use the smallest bodies that will give you the power output you seek, but be aware, power is addictive. If you go 48's I doubt you will lose any noticeable driveability over 45's but you will not be choking it at higher revs. All in my humble opinion of course, you are free to use whichever internet wisdom you choose

Thanks Guys PM`s are on their way

Hi All, I`m after a pair of windscreen stanchions for an S3 please, and doors to suit the same car too Mine is a metric chassis if that makes a difference ? Cheers Dom