30 replies to this topic

[mini13]

Turbophil

Good chap to deal with, and knows his stuff,

[Wazzah]

I have a SC Supersport head on my SPI with 1.5 ration rockers.

It has makes nice torque and is very drivable around town pulling strongly from 1800 rpm in 3rd and 4th.

36mm inlets from memory and a significant port job.

I had the SC Delta 400 and Throttle body kit on it which I have since removed.

It had a significant improvement on wide open throttle but was hopeless around town.

Fuel economy was also crap.

I had a 400hp GT Ford Falcon that was better on fuel (sometimes!!!)

I have a 5 speed gearbox on the way and have been collecting some parts for the engine when it all comes out.

MED lightweight flywheel and clutch assembly, SC lightweight rods and an SW5 are the main items.

I dearly want a wedged crank and like the SC product but do not think it will relate to any extra HP.

Rotating mass will be reduced by a couple of kilos which I reckon will be really noticeable through the gears.

Over Easter isolation I'm going to fit a minisport HIF44 manifold with the standard SPI throttle body side draught style.

My theory is this same manifold was responsible for a lot of the SC throttle bodies performance despite running super rich.

I have an adaptor kit completed (self made) and am redesigning the linkage to the stepper motor as it struggles to clear the underside of the bonnet as it is rotated 90 degrees rearwards.

My SC Delta experience has revealed just how good the Rover ECU is over all engine operating conditions.

If that works there is a guy in Japan who has modified throttle bodies with larger venturies and adjustable pressure regulator all within the Rover unit.

I hope the lockdown continues so I have time to get this all done.

[OzOAP]

Large bore throttle body.
I use to do them, mainly for Wood and Picket as a part of their SPI tuning kit.
Would give up to 10% improvement.
1275, std cam, modified head, rockers, LCB was 75hp, modified throttle body gained 7hp.
1380, 255 cam, modified head, rockers, LCB gave 90hp, modified body gave an additional 9hp.

Edited by OzOAP, 07 April 2020 - 05:31 AM.

[mini13]

Sounds like the setup was way way off, did you get it on a rolling road?

I have a SC Supersport head on my SPI with 1.5 ration rockers.
It has makes nice torque and is very drivable around town pulling strongly from 1800 rpm in 3rd and 4th.
36mm inlets from memory and a significant port job.
I had the SC Delta 400 and Throttle body kit on it which I have since removed.
It had a significant improvement on wide open throttle but was hopeless around town.
Fuel economy was also crap.
I had a 400hp GT Ford Falcon that was better on fuel (sometimes!!!)
I have a 5 speed gearbox on the way and have been collecting some parts for the engine when it all comes out.
MED lightweight flywheel and clutch assembly, SC lightweight rods and an SW5 are the main items.
I dearly want a wedged crank and like the SC product but do not think it will relate to any extra HP.
Rotating mass will be reduced by a couple of kilos which I reckon will be really noticeable through the gears.
Over Easter isolation I'm going to fit a minisport HIF44 manifold with the standard SPI throttle body side draught style.
My theory is this same manifold was responsible for a lot of the SC throttle bodies performance despite running super rich.
I have an adaptor kit completed (self made) and am redesigning the linkage to the stepper motor as it struggles to clear the underside of the bonnet as it is rotated 90 degrees rearwards.
My SC Delta experience has revealed just how good the Rover ECU is over all engine operating conditions.
If that works there is a guy in Japan who has modified throttle bodies with larger venturies and adjustable pressure regulator all within the Rover unit.
I hope the lockdown continues so I have time to get this all done.

[humph]

There's a lot of talk oh bhp figures in this thread, but how does the starting spec effect this? What I mean is that on the spi there is a difference between the starting bhp of the non-Cooper and Cooper models. Does this spec effect the mods recommended and the estimated final bhp figure?  My Sidewalk is a non-Cooper spec, so is that power difference always going to be there?

[sonscar]

I am a relative oldie and the talk of BHP amuses me greatly.In my experience there is no substitute for torque,especially from low down.Slipping the clutch at lights lost its appeal years ago.Subjectively look at the rpm range you drive in and look for a wide torque spread encompassing that.Just my thoughts from an ageing driver.Steve..

[DeadSquare]

I am a relative oldie and the talk of BHP amuses me greatly.In my experience there is no substitute for torque,especially from low down.Slipping the clutch at lights lost its appeal years ago.Subjectively look at the rpm range you drive in and look for a wide torque spread encompassing that.Just my thoughts from an ageing driver.Steve..

 

Can you also remember the man on the horse in front of the car, waving his red flag ?...................Lol

[sonscar]

No he was always too fast for me!Steve..

[Turbo Phil]

Thanks to the folk above who recommended me, i appreciate it.

Phil.

[Wazzah]

Large bore throttle body.
I use to do them, mainly for Wood and Picket as a part of their SPI tuning kit.
Would give up to 10% improvement.
1275, std cam, modified head, rockers, LCB was 75hp, modified throttle body gained 7hp.
1380, 255 cam, modified head, rockers, LCB gave 90hp, modified body gave an additional 9hp.

May I ask what size throttle body? The guy in Japan has a range of sizes from 42mm to 50mm. I'm boring mine to 1310cc and think 44 mm would be plenty.

[cal844]

Thanks to the folk above who recommended me, i appreciate it.

Phil.

No worries buddy, we're all in the forum to help one another where we can.

I try to recommend forum members where I can, support the small businesses

[Screwdriver]

 

Large bore throttle body.
I use to do them, mainly for Wood and Picket as a part of their SPI tuning kit.
Would give up to 10% improvement.
1275, std cam, modified head, rockers, LCB was 75hp, modified throttle body gained 7hp.
1380, 255 cam, modified head, rockers, LCB gave 90hp, modified body gave an additional 9hp.

May I ask what size throttle body? The guy in Japan has a range of sizes from 42mm to 50mm. I'm boring mine to 1310cc and think 44 mm would be plenty.

 

 

Same question for you OzOAP. And how was in town drivability? 

Anything else special or unique about the Wood and Picket SPi kit?

[OzOAP]

Large bore throttle body.
I use to do them, mainly for Wood and Picket as a part of their SPI tuning kit.
Would give up to 10% improvement.
1275, std cam, modified head, rockers, LCB was 75hp, modified throttle body gained 7hp.
1380, 255 cam, modified head, rockers, LCB gave 90hp, modified body gave an additional 9hp.

May I ask what size throttle body? The guy in Japan has a range of sizes from 42mm to 50mm. I'm boring mine to 1310cc and think 44 mm would be plenty.

They are 41mm standard. I was supplying 44mm

[OzOAP]

Same question for you OzOAP. And how was in town drivability?

Anything else special or unique about the Wood and Picket SPi kit?

They were 44mm.
Drivability was good. Power gain was very linier throughout the rev range.
I have a Wood and Picket catalogue somewhere listing the OAP range of components from bolt on parts, rockers, heads ect to full engines.Will have to try and find it.

[Screwdriver]

Many thanks for digging that up. Does anyone still supply the 44mm TB?

Edited by Screwdriver, 09 April 2020 - 12:30 AM.