520SX... It's alive

[shpub]

Well fired up the supercharged 5.2 litre V8 today for the first time in the car. Started easily as well. Running the detuned spec so only around 480-500 lb/ft of torque and 460-70 bhp.

One small water leak to sort out - gasket needs replacing on the water hose flange and the fuel pumps are having difficulty maintaining pressure so that needs looking at and uprating with bigger pumps. Also got a bit of belt squeal at idle. Something to do over Xmas.

The throttle response is incredible. Just touch the throttle and the engine revs. So much so that I'm going to fit an additional return spring as once the throttle is open it doesn't want to close because of the boost.

Edited by shpub on Sunday 17th December 17:35

[pwd95]

Was wondering how it was coming having read about it previously Good luck with the fettling.

[Selmer]

shpub said:

Running the detuned spec so only around 480-500 lb/ft of torque and 460-70 bhp....

I like it!

[stainless_steve]

[Boosted LS1]

Compression must be quite high, what boost are you hoping to use with the chargecooler?

Boosted.

[rev-erend]

Well done Steve..

Look forward to seeing it at the BBWF

[BIG DUNC]

Well done Steve, that looks really nice. I look forward to seeing it in the flesh ( so to speak ). In the mean time, have fun with it.

[shpub]

Boosted LS1 said:

Compression must be quite high, what boost are you hoping to use with the chargecooler?

Boosted.

Getting around 9psi boost but the air charge wasn't going above 29 C. The Chargecooler is the limiting factor and an improved design is in the pipeline that should get the engine into the 500+ bhp range. At least that was what the dyno experiments gave. I'll run this spec for this year's campaign and go for the hike in 2008... if it hasn't scared me in the meantime.

[Boosted LS1]

shpub said:

Boosted LS1 said:

Compression must be quite high, what boost are you hoping to use with the chargecooler?

Boosted.

Getting around 9psi boost but the air charge wasn't going above 29 C. The Chargecooler is the limiting factor and an improved design is in the pipeline that should get the engine into the 500+ bhp range. At least that was what the dyno experiments gave. I'll run this spec for this year's campaign and go for the hike in 2008... if it hasn't scared me in the meantime.

Sounds good already You must be heading for 13:1 c/r so an air intake charge of 29 c is really low so the coolers working well. Are these dyno readings or road readings? I did a 5.1 turbo and predicted 500 lbs/ft torque from 2100 rpm so you will certainly be in the same ball park if not better at those low rpm's. The turbo engine had a much higher intake charge, it would boil water if the chargecooler pump wasn't swutched on! You're going to have a lot of low down grunt

Edited to say,

I had managed to get my compression down to 9:1.

Boosted.

Edited by Boosted LS1 on Sunday 17th December 23:27

[shpub]

They are dyno readings. The real breakthrough was John Eales convincing me that we needed a set of special pistons to reduce the CR and prevent detonation. getting the pistons made delayed things by a couple of months but it was worth it. John was really pleased with the results and we think there is more to come. As I said, already planning the next two power hikes. Oh yes..... it has loads of low down torque. 320 lb/ft at 2000. 400 at 3000....

[rev-erend]

I think Scottie from the Starship Enterprise would now be says..

But Cap'n the chassis - she cannie tak much mooorree..

[leorest]

Thanks for the update. We are all watching with interest

shpub said:

...Running the detuned spec so only around 480-500 lb/ft of torque and 460-70 bhp....

Even at these lowly levels which will be the loudest? The insane laughter or screams of fear?
Hope you can get it to the next Fest. I predict big crowds!

[shpub]

leorest said:

Hope you can get it to the next Fest. I predict big crowds!

Should be able to... it's still road legal and insured so I can poodle up to Ettington in it!

[campbell]

shpub said:

Well fired up the supercharged 5.2 litre V8 today for the first time in the car. Started easily as well. Running the detuned spec so only around 480-500 lb/ft of torque and 460-70 bhp.

One small water leak to sort out - gasket needs replacing on the water hose flange and the fuel pumps are having difficulty maintaining pressure so that needs looking at and uprating with bigger pumps. Also got a bit of belt squeal at idle. Something to do over Xmas.

The throttle response is incredible. Just touch the throttle and the engine revs. So much so that I'm going to fit an additional return spring as once the throttle is open it doesn't want to close because of the boost.

Edited by shpub on Sunday 17th December 17:35

SWEET

This would look good under the bonnet of my SEAC...

Nice job Steve, i think we are all looking foward to seeing the beasy in the flesh as soon as...

Cambelt

[GreenV8S]

Edited by GreenV8S on Monday 18th December 22:43

[jmorgan]

Holy moly.

[dickymint]

Looks down right evil

Like the idea of dating the oil filter Steve.

[jmorgan]

dickymint said:

Looks down right evil

Like the idea of dating the oil filter Steve.

You date the filter, I'll take the the rest of the engine out for lunch.........

[pwd95]

jmorgan said:

You date the filter, I'll take the the rest of the engine out for lunch.........

[rev-erend]

pwd95 said:

jmorgan said:

You date the filter, I'll take the the rest of the engine out for lunch.........