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The Cappa Is Back On Gas :-)

 
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Coops
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Joined: 17 Nov 2006
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Location: Newbury, Berks

1986 Ford Capri

PostPosted: Sun Apr 24, 2011 8:02 pm    Post subject: The Cappa Is Back On Gas :-) Reply with quote

installed all the nitrous gear back in the cappa today,
didnt have time to do any testing so fired a 100 jet into the nitrous pulsoid (50bhp) and a 35 jet into the fuel pulsoid,
quick trip up a local private road im allowed to use and Blimey it never pulled like that on a 50 shot before, made me Very Happy from ear to ear,
god knows what you did to the pulsoids Pel but shes a different car on gas now mate,
at WOT its running Rich which i think is the safe way to be at present (0.85 lambda on gas) im tempted to try a bit more gas, oh that was on a 1200psi bottle pressure.
how far before i need to retard and change plugs? didnt think i would like nitrous again Wink
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Regards Tony C (COOPS)

MS2 V3.57 Ecu mapable efi and wasted spark ignition.
Rotrex C38-91 supercharger and Cossie RS500 Intercooler @ 14psi of Boost. 404 RWHP, (4.6)
New Forged 4.8 V8 kitted out with the dogs Cajones of parts and a procharger D1SC. 2017 Very Happy
Sponsored by: www.v8performanceparts.co.uk, www.interpart.biz, www.caprisport.com & www.baileyperformance.co.uk
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mgbv8
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Joined: 18 Nov 2006
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1975 MG MGB GT V8

PostPosted: Sun Apr 24, 2011 9:30 pm    Post subject: Reply with quote

Well done dude!!

At that bottle pressure you are way rich.
What fuel pressure in the rail??

Drop the bottle pressure to 900psi for the next test so we can see how that changes the readings??

Make sure the bottle is as full as poss though so pressure drop does not come into the equation. Make sure you log bottle pressure before and after the test run..

On the 4.6 you can pretty much stay at stock timing for a 100 shot based on my own results. To be honest I can run a 300shot on 28 degrees btdc or 24 degrees btdc and still see the same track times..

That is something you will need to play with yourself.

Stock plugs will be ok (depending on your ign system) up to a 150 shot. Over that and you should think about B8ecs plugs.

Are you still running cast pistons??

Re the nitrous and fuel solenoids.!
All I did was build them and set them up as they should have come to you from the makers ?????


Pel
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Perry Stephenson
MGB GT + Rover V8
9.62 @ 137.37mph
Now looking for 8 seconds with a SBC engine
http://www.youtube.com/watch?v=nVscbPHgue0&list=UUqIlXfSAoiZ--GyG4tfRrjw

https://www.youtube.com/watch?v=eg3avnsNKrc&index=2&list=FLqIlXfSAoiZ--GyG4tfRrjw
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Coops
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Joined: 17 Nov 2006
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Location: Newbury, Berks

1986 Ford Capri

PostPosted: Sun Apr 24, 2011 10:03 pm    Post subject: Reply with quote

Hi Mate,
cheers for the reply,

Fuel rail psi = 36psi (efi bosch 044 motorsport fuel pump)
ignition system: = fully mapped crank trigger ignition system with 8mm mallory pro sidewinder leads, ford coil packs x2 ngk stock rv8 plugs? 6's?.

yup still running cast mate cant afford forged ones Crying or Very sad

any other info you need?
_________________
Regards Tony C (COOPS)

MS2 V3.57 Ecu mapable efi and wasted spark ignition.
Rotrex C38-91 supercharger and Cossie RS500 Intercooler @ 14psi of Boost. 404 RWHP, (4.6)
New Forged 4.8 V8 kitted out with the dogs Cajones of parts and a procharger D1SC. 2017 Very Happy
Sponsored by: www.v8performanceparts.co.uk, www.interpart.biz, www.caprisport.com & www.baileyperformance.co.uk
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stevieturbo
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Joined: 18 Nov 2006
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1980 Ford Granada

PostPosted: Sun Apr 24, 2011 10:52 pm    Post subject: Reply with quote

Is that sort of AFR considered safe for Nitrous ?

n/a it would be for sure.

With boost, no way would it be.

I'd guess Nos would be somewhere in the middle, maybe edging towards boosted AFR's ?
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9.85 @ 144.75mph
202mph standing mile
http://www.youtube.com/watch?v=XgWRCDtiTQ0
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mgbv8
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1975 MG MGB GT V8

PostPosted: Mon Apr 25, 2011 6:10 pm    Post subject: Reply with quote

stevieturbo wrote:
Is that sort of AFR considered safe for Nitrous ?

n/a it would be for sure.

With boost, no way would it be.

I'd guess Nos would be somewhere in the middle, maybe edging towards boosted AFR's ?



This is always a subject great debate Stevie!!
I tend to rely on plug readings as afr on nitrous can not be taken as gospel eh?

This is where the dyno can help iron out the finer settings on my carb setup.

As a side issue, what sort of afr would we be looking for with a blower on a 4.6 doing say 8psi ??
I need to learn about this stuff now I reckon Wink
_________________
Perry Stephenson
MGB GT + Rover V8
9.62 @ 137.37mph
Now looking for 8 seconds with a SBC engine
http://www.youtube.com/watch?v=nVscbPHgue0&list=UUqIlXfSAoiZ--GyG4tfRrjw

https://www.youtube.com/watch?v=eg3avnsNKrc&index=2&list=FLqIlXfSAoiZ--GyG4tfRrjw
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stevieturbo
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1980 Ford Granada

PostPosted: Mon Apr 25, 2011 7:03 pm    Post subject: Reply with quote

mgbv8 wrote:
stevieturbo wrote:
Is that sort of AFR considered safe for Nitrous ?

n/a it would be for sure.

With boost, no way would it be.

I'd guess Nos would be somewhere in the middle, maybe edging towards boosted AFR's ?



This is always a subject great debate Stevie!!
I tend to rely on plug readings as afr on nitrous can not be taken as gospel eh?

This is where the dyno can help iron out the finer settings on my carb setup.

As a side issue, what sort of afr would we be looking for with a blower on a 4.6 doing say 8psi ??
I need to learn about this stuff now I reckon Wink


Depends on intake temps, compression ratio, type of blower etc

Not all boosted systems are as efficient as others. Generally speaking an efficient setup with relatively cool air, high 11's would be safe for only 8psi.

With a hot air rootes design...richer.

I run my own at lowish 11's or high 10's
Ive no desire to blow it up, and running leaner would have only a very very very small benefit on performance.

But EGT's and power may dictate different AFR's Only dyno testing would reveal the optimum.

I dont do dynos, so I play safe.
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9.85 @ 144.75mph
202mph standing mile
http://www.youtube.com/watch?v=XgWRCDtiTQ0
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Coops
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1986 Ford Capri

PostPosted: Wed Apr 27, 2011 1:05 pm    Post subject: Reply with quote

Did another brief test today,
bottle pressure was just over 900psi, (not sure on weight yet have to remove the bottle and weigh it)
set the ramp time to 3 secs start at 25 shot building to 100% (50 shot)
car accelerates well from standing start, BUT as you get to 2.5k rpm it lights the street tyres up and spins em Confused

also lambda didnt really change, stayed around the 0.85 range at WOT, and bottle pressure had dropped back to 900 psi when i checked,
_________________
Regards Tony C (COOPS)

MS2 V3.57 Ecu mapable efi and wasted spark ignition.
Rotrex C38-91 supercharger and Cossie RS500 Intercooler @ 14psi of Boost. 404 RWHP, (4.6)
New Forged 4.8 V8 kitted out with the dogs Cajones of parts and a procharger D1SC. 2017 Very Happy
Sponsored by: www.v8performanceparts.co.uk, www.interpart.biz, www.caprisport.com & www.baileyperformance.co.uk
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Coops
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Joined: 17 Nov 2006
Posts: 6043
Location: Newbury, Berks

1986 Ford Capri

PostPosted: Wed Apr 27, 2011 2:40 pm    Post subject: Reply with quote

6lb gas in bottle.
_________________
Regards Tony C (COOPS)

MS2 V3.57 Ecu mapable efi and wasted spark ignition.
Rotrex C38-91 supercharger and Cossie RS500 Intercooler @ 14psi of Boost. 404 RWHP, (4.6)
New Forged 4.8 V8 kitted out with the dogs Cajones of parts and a procharger D1SC. 2017 Very Happy
Sponsored by: www.v8performanceparts.co.uk, www.interpart.biz, www.caprisport.com & www.baileyperformance.co.uk
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mgbv8
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Joined: 18 Nov 2006
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1975 MG MGB GT V8

PostPosted: Wed Apr 27, 2011 5:45 pm    Post subject: Reply with quote

You having fun mate ?? Smile
_________________
Perry Stephenson
MGB GT + Rover V8
9.62 @ 137.37mph
Now looking for 8 seconds with a SBC engine
http://www.youtube.com/watch?v=nVscbPHgue0&list=UUqIlXfSAoiZ--GyG4tfRrjw

https://www.youtube.com/watch?v=eg3avnsNKrc&index=2&list=FLqIlXfSAoiZ--GyG4tfRrjw
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Coops
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Joined: 17 Nov 2006
Posts: 6043
Location: Newbury, Berks

1986 Ford Capri

PostPosted: Wed Apr 27, 2011 5:53 pm    Post subject: Reply with quote

just a bit Laughing
im tempted to up her to 75 shot Laughing
_________________
Regards Tony C (COOPS)

MS2 V3.57 Ecu mapable efi and wasted spark ignition.
Rotrex C38-91 supercharger and Cossie RS500 Intercooler @ 14psi of Boost. 404 RWHP, (4.6)
New Forged 4.8 V8 kitted out with the dogs Cajones of parts and a procharger D1SC. 2017 Very Happy
Sponsored by: www.v8performanceparts.co.uk, www.interpart.biz, www.caprisport.com & www.baileyperformance.co.uk
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mgbv8
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Joined: 18 Nov 2006
Posts: 5325


1975 MG MGB GT V8

PostPosted: Wed Apr 27, 2011 5:56 pm    Post subject: Reply with quote

ADDICT ALERT !!!! Laughing
_________________
Perry Stephenson
MGB GT + Rover V8
9.62 @ 137.37mph
Now looking for 8 seconds with a SBC engine
http://www.youtube.com/watch?v=nVscbPHgue0&list=UUqIlXfSAoiZ--GyG4tfRrjw

https://www.youtube.com/watch?v=eg3avnsNKrc&index=2&list=FLqIlXfSAoiZ--GyG4tfRrjw
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Coops
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Joined: 17 Nov 2006
Posts: 6043
Location: Newbury, Berks

1986 Ford Capri

PostPosted: Wed Apr 27, 2011 6:28 pm    Post subject: Reply with quote

I know mate its bad news,

how far can i push these NGK 6's?
_________________
Regards Tony C (COOPS)

MS2 V3.57 Ecu mapable efi and wasted spark ignition.
Rotrex C38-91 supercharger and Cossie RS500 Intercooler @ 14psi of Boost. 404 RWHP, (4.6)
New Forged 4.8 V8 kitted out with the dogs Cajones of parts and a procharger D1SC. 2017 Very Happy
Sponsored by: www.v8performanceparts.co.uk, www.interpart.biz, www.caprisport.com & www.baileyperformance.co.uk
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kiwicar
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Joined: 18 Nov 2006
Posts: 5461
Location: Milton Keynes


PostPosted: Thu Apr 28, 2011 9:24 am    Post subject: Reply with quote

"car accelerates well from standing start, BUT as you get to 2.5k rpm it lights the street tyres up and spins em "
Pull away in second???
Best regards
Mike
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