sr20de tuning

[kms racing]

iv done a search and found a few things about the engine , what can be done to them to get decent power out of them ie. cams bodies ect , whats the best way to raise the compression ratio
can any one point me in the right direction

nick

[PhatBob]

Originally Posted by kms racing

iv done a search and found a few things about the engine , what can be done to them to get decent power out of them ie. cams bodies ect , whats the best way to raise the compression ratio
can any one point me in the right direction

nick

I've been talking to a man in South Africa who does a lot of NA tuning for these engines, the very very very most you're likely to get is ~280bhp on a full race, and that would be with Touring car cams, exhaust manifold, throttle bodies, 13:1 compression and a large amount of port work.

I've had my head gasflowed, skimmed by 1.2mm (should be close to 11.5:1) and will be running PROCAR cams (300deg duration @ standard lift for a South African race specification) as these are the only decent cams that mean I dont have to pocket the pistons, solid valve lash adjusters, double springs, throttle bodies. I should get close to 200bhp if I'm lucky, the final hike in power would be to go silly on the bottom end with madness like longer rods, stupidly high compression, and pistons machined for uber high lift cams.

[Stavros]

IIRC the touring car engines "only" rev to 8.5k and have set port/valve sizes, hence why 280 is about it.

I bet over 280 is do-able if you wanted.

Stupid idea anyhow when a mildly tuned DET will be 10 times cheaper and have twice the toruqe and drivability with the same power.

[sideways.taff]

Braaapp.
300HP NA Touring Car SR20

[PhatBob]

Originally Posted by Stavros

IIRC the touring car engines "only" rev to 8.5k and have set port/valve sizes, hence why 280 is about it.

I bet over 280 is do-able if you wanted.

The 280 figure was given to me by Field Motorsport Engineering who do engines for a single seater competition in Spain (or it could have been Portugal)

Originally Posted by Stavros

Stupid idea anyhow when a mildly tuned DET will be 10 times cheaper and have twice the toruqe and drivability with the same power.

Yes, and no, for drifting, which is what this forum is about then theres no point in pissing about with DE engines. From my point of view its a sound idea because a turbo in Modified Production saloon categories means you're in the same category of 4WD turbos and 'specials' like mid engined V8 cars, where a 1998cc engine puts you in with mainly FWD cars. I'll still get beaten, but it wont be such a sound thrashing as by the over 2000cc group.

[Kamikaze_S15]

how different are SR20DET/DE to each other??
is there a huge amount of internal differences?

[PhatBob]

The DE is a 52J head on a 53J block - the DET has a 53J head on a 53J block.
This would suggest that the DE bottom end is the same, but never having had it apart I couldnt say for sure - I did hear talk of there being no piston oil squirters on the DE.

The 52J head has a completely different port design to any of the other heads I've seen (Red top high port, VVT and GTiR) and when he was doing the valve seat work on my head Ben@Angelworks said that the DE head looked as if it had 'superior downdraft' to the other SR heads, I'm sure that this is a good thing, but I can't honestly say I know what it means.

The DE also has a distributor on the side of the head, I tried my DET CAS in there but it was not a perfect fit so there are differences there - PhatBob sad techie fact #40372: The DE CAS disk shaft diameter is 0.5mm larger than the DET one.

[kms racing]

cheers for the info guys ..... so basicly its going to cost a small fortune to get decent power out of a de

how well would it react to just the comp ratio being raised and a set of cams and obviously a re-map , exhaust . and air filter

[Mitch]

Originally Posted by PhatBob

The DE also has a distributor on the side of the head, I tried my DET CAS in there but it was not a perfect fit so there are differences there - PhatBob sad techie fact #40372: The DE CAS disk shaft diameter is 0.5mm larger than the DET one.

I was led to believe the CAS fitted in and could be used if you DET'd the engine. Probably by someone who hasn't tried it. I'm going to strip my DE and just rape the crank from it to resurrect my DET, so hopefully it'll be the same, and I can let you know for sure if there are squirters for the pistons or not. (I've been told not, but we'll see)

[PhatBob]

Originally Posted by kms racing

cheers for the info guys ..... so basicly its going to cost a small fortune to get decent power out of a de

how well would it react to just the comp ratio being raised and a set of cams and obviously a re-map , exhaust . and air filter

A mate of mine had a Sunny GTi with a close approximation of the same engine as we're talking about here, skimmed 1mm off the head and had some light port work done and made 170bhp, exhaust and cams were stock.

Apparently there are exhausts manifolds available for the RWD DE engine but I've never seen one listed anywhere.

I was hoping to have mine done by now, but as I managed to miscalculate the amount of material to grind off the shims (0.5mm too much) I'm trying to a) find some second hand shims, b) work out the exact amount to take off.

[Raceworx]

SR16VE pistons from nissan will raise you comp to 11.5 and there already notched with valve reliefs... if you wanted revs id go with a sleeved block and 90mm pistons with an sr16ve crank and rods remains 2.0 but has a much better rod ratio...

if i were using it for drifting though id go 90mm high comp pistons with a tomie or brian crower 91mm crank that will give you close to 2400cc's and a nice chunk of tourque with a decent manifold cams id look at solid lash dule springs ect and ITB's 300 plus would be acheivable.....

[Raceworx]

you can get the SR16 pistons for $60 from gspec btw

[PhatBob]

Originally Posted by PhatBob

The DE also has a distributor on the side of the head, I tried my DET CAS in there but it was not a perfect fit so there are differences there - PhatBob sad techie fact #40372: The DE CAS disk shaft diameter is 0.5mm larger than the DET one.

With the head on the bench its apparent that the DE and DET CAS/Distributors are in fact interchangable.
If this has caused anyone any inconvience, kiss my swingers.

[kms racing]

so with them being interchangeable ....... would it be the case of the sr20det loom would fit on a de with a cas instead of a dizzy . as i am having problems finding a wiring diagram of the little white plug that connects the engine loom to the car loom on a 180 sr20de engine loom as i am putign the de in a uk200
if it is il just use a det loom and cas as i can find a wiring diagram for it very easy

[PhatBob]

Originally Posted by kms racing

so with them being interchangeable ....... would it be the case of the sr20det loom would fit on a de with a cas instead of a dizzy . as i am having problems finding a wiring diagram of the little white plug that connects the engine loom to the car loom on a 180 sr20de engine loom as i am putign the de in a uk200
if it is il just use a det loom and cas as i can find a wiring diagram for it very easy

You're moving the problem around though, as you'll need to go to coil on plugs and all who knows what else to get the ignition and fuelling right.

Rob

[tech]

really need to get mine on the rollers to see its pushing out, no where near 280bhp though....

[PhatBob]

Originally Posted by tech

really need to get mine on the rollers to see its pushing out, no where near 280bhp though....

What have you done to it?

Rob

[warner]

Originally Posted by PhatBob

Apparently there are exhausts manifolds available for the RWD DE engine but I've never seen one listed anywhere.

There are Taxidori had that NA silvia for a while, And it had a TRUST mani iirc. What are you planning for your manifold?
Didnt realise you were going NA, you need to start a project thread

[tech]

Originally Posted by PhatBob

What have you done to it?

Rob

unaware of the full spec (as usuall with imports) what can be seen:

1993
SR20 DE Engine
ARC super induction system and cyclone pipework
Stainless 4 branch manifold and large bore exhaust system
(Short ratio gearbox with quick shift)

At a guess it's running around 180bhp, going by the fact my previous car was RR'd not long after I sold it and gave out 205bhp

[kms racing]

Originally Posted by PhatBob

You're moving the problem around though, as you'll need to go to coil on plugs and all who knows what else to get the ignition and fuelling right.

Rob

ahh ok then ....... does any one know where i can get a wiring diagram/pin out for the engine loom on a 97 180sx sr20de as the white plug down by the ecu plug that connects the engine loom to the car loom is diffrent on the 180 to the uk s13 plug

i think the plan for the engine now is going to be up the cr . cams ,exhaust mani and system , and obvious suppoting mods then once i have some moneys il get some itbs or webbers (as i already have some lieing around) with standlone ecu

what sort of rough price would vems cost me fitted and mapped

nick