Nissan S14 Sprint Car

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Well I was going to trailer the car over to APT for suspension alignment and a rolling road session.
But I can get the alignment done through a mate locally, and then pay Ã,£40 for the day at Gosfield where Matt (Team Dandism) did has car.

[irishtwincam]

bump:

Pics vids and various other media are now required if progress has been made!

Heres something to compare against :D

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No vids, I have a few pics but haven't taken them off my camera yet.

Bit of a disappointment really as the engine only made 159.9bhp@6500rpm

Towards the end of the day the screw-on gland on the end of the throttle cable came off, and I had to remove the vacuum connection to the brake booster so I had room to work.  Unfortunately I forgot to put the pipe back on so when I noticed the problem and reconnected the pipe I found that the idle mixture was very rich.  Thankfully the pipe draws almost no vacuum past 3 to 5% of throttle so its only a few cells that are affected.
A fortunate side-effect is that I found just how much the RPM can be controlled by this vacuum feed and it will allow me to use an IACV (if I can find one with a 5mm ID) I tried a boost valve that I had sitting around and found that it had a bit of an effect, but was too restrictive to be much use.  I might be able to make something using one of the old Nissan solenoids, with a block of aluminium and a t- piece.

Of course with AlphaN the opening of an IACV will not be reflected in the fuel and ignition table as it is in speed density, so a while back I asked for a change that would scale the TPS value based on the duty/position of the IACV, so you'd set a TPS value that corresponds to the the IACV being full open (say 2%) and then the TPS value would be incremented with the %age of the IACV - so if the IACV is at 50percent duty/half open, the TPS would be adjusted to read 1%.
This is apparently in the versions above 1.1.30, none of which are stable enough for releases...  So I'm now stuck like so many of the rest of us I'm stuck waiting on a feature...

Rob

[irishtwincam]

Aw, only a 30hp increase with ITBs and some compression........
Nice results I say!

How many torques :D

plz 2 have dyno sheet  ::)

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I was basing my hopes of significant power on Ben Fenner's Dyno result:

With increases from the mods that I'd done giving me 15 to 20bhp more, not 9bhp more...

[irishtwincam]

Comapre full throttle VE/spark/lamda?

Are the engines different variations?
SE-R might have VTC or some such?
Revised ports etc?
Maybe your tubby exhaust is hurting things?

[gunni]

What are the specs rob?
something is a miss, I thought the head had pretty high mods?

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The head has had 1.5mm skimmed off, Ben at Angelworks did me a bowl and valve seat job with some light porting work.
On its dyno day out...



Even though its performace was shameful it was treated to some wheel alignment.

Its an awesome alignment machine.

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And here's the disgraceful dyno chart:

[BenFenner]

Comapre full throttle VE/spark/lamda?

Are the engines different variations?
SE-R might have VTC or some such?
Revised ports etc?
Maybe your tubby exhaust is hurting things?

Rob's and my engine should be directly comparable in stock form. Edit: His is about 11.0:1 compression (mine is 9.5:1)
I don't have VTC I don't think. Not even sure what that is, variable valve timing and/or lift?
I don't have any revised ports. My engine is completely stock from the air intake to the exhaust tail pipe.

Rob, don't feel bad. I'm making significantly more power than anyone else has ever made with a stock DE. I wouldn't take it too hard. =]

[gunni]

Torque is 137lbs or so?
ThatÃ,´s about 185nm torque,
Definitely some torque missing. I would have expected 100nm/liter to be there

[irishtwincam]

Can you both post detailed pics of your setups?
Full throttle fuel, spark, and lambda.
Compression test figures.

Do your engines have the same cam spec?
Are the heads varied? Silvertop vs blacktop or whatever?
Perhaps theres some mechanical difference causing the issue?

[cliffb75]

What cams are you using and at what timings?

Looking at the graph its a very nice road car setup with a swell of torque through the midrange.

If you want more power then advancing the inlet would probably help, or stepping up to a cam with a higher lift and therefore longer duration. But you will lose that midrange bulge.....

Alternatively, have you considered fitting a turbocharger? I hear they're all the rage with the kids ;)

[Denmark]

ItÃ,´s always great when putting an other engine in the car, waiting for a build up,
this is even a bit crasy to put on ItbÃ,´s, ::)

When you are just waiting to run the Sr20DET  ;D


/Skassa

[irishtwincam]

without cam gears Im sure the 1.0mm skim would ahve thrown the cam timing a bit?