Lola - Ke55 4a-gze

[ancullen]

CURRENT PARTS WISHLIST (PM ME FOR MY ADDRESS IF YOU WISH TO SEND ANYTHING FROM THE LIST BELOW ;)):

 

4A-GE Bigport Head - $?

Fidanza Cam Gears - $310-330

Crower Cams 61822-2 - $515 + Shipping

Toda 0.6mm Metal Head Gasket - $181

Toda Valve Springs - $244

32mm intake valves & 27.5mm exhaust valves - $275, but negotiating for lower price

 

With these parts installed, plus a dyno tune, I'd be hoping to get about 120kW at the wheels, although that being said, I've no idea what power I'm currently making. A standard 4A-GZE in an AE86 makes about 100kW at the wheels though, so 120 is a very conservative aim.

Edited September 7, 2006 by ancullen

[ancullen]

Went and found out today how much a dyno tune would be. $82 for dyno use plus $77/hour for labour. If the engine isn't too far off what it needs to be, it generally only takes about an hour. But I reckon mine might need a couple of hours work, so I'm going to budget $300 to be safe. Would prefer to wait until I've got some of the above parts before I go for a tune. I'm not saying that I'll be getting all of these very shortly, but hopefully a bit here and a bit there. ;)

[ancullen]

Oh yeah, I can get a bigport head, with cams, for $180 at the moment, but it seems a bit steep (plus I'd have to pay for postage). There may also be a ported & polished smallport head available with big valves, and if the price is right on that, I might get it instead of a bigport, big valves and valve springs, as it already comes with all those.

Edited September 7, 2006 by ancullen

[Des]

Might the valves and the bigport head be on ebay?

[ancullen]

I have a few parts suppliers with whom I am negotiating. eBay can sometimes provide some bargains, but at other times can be really shite.

[ancullen]

Have just been playing with Dyno2000 engine calculation software. I had to guess some figures, but did so to start off with a basic dyno chart for an AE101 4A-GZE, then began modifying from there. All the following figures are at the flywheel.

 

The engine started off in stock form with 171hp at 7,000rpm and 154lb/ft at 4,500rpm.

 

With bigport cams and 9.5:1 compression (as can be gained with a 0.6mm head gasket), I got up to 194hp @ 7,000rpm and 162lb/ft at 4,500rpm. A nice little improvement.

 

I now did the ABV mod (all that I changed was max boost from 10psi to 13.5psi), the only change was in torque, which went up to 163lb/ft at 4,500rpm. This doesn't seem right, so I think I must have to change some other value - can anyone help with this?

 

With the above changes, but now with Kelford 193-B cams instead of bigport, I got 199hp @ 8,000rpm, and 162lb/ft @ 4,500rpm. Not really worth the effort or expense if this is anywhere near accurate.

 

The biggest change was by using Crower 61822-2 Cams as well as the 9.5:1 compression and ABV mod. With this setup I got 270hp @ 10,000rpm (no way will I ever be revving that high), and 168lb/ft at 6,000rpm.

 

Finally I tried the same setup as above but with big valves (32.00mm intake, 27.5 exhaust). This got me 289hp @ 10,000rpm and 171lb/ft @ 6,000rpm. Very cool, but not possible without me getting custom pulleys made up so the SC12 doesn't self-destuct due to being run at 13,000rpm.

 

What this indicates to me (if this software is half decent), is that this grind of Crower Cams, which is meant to be designed specifically for the 4A-GZE, is pretty inappropriate as it revs too high. Although, it could just be that the software thinks higher revs will produce far higher power. With all of the examples prior to the Crower Cams ones, it had seemed fairly realistic (although I was surprised by how little the torque figure changed). I was under the impression that the Crower Cams would only increase the power band slightly higher into the rpm range, but would provide more power (or more likely, more torque) as a result of the far higher lift characteristics. Is anyone familiar with this or similar software who could advise me on what I might have done wrong?

[Biggo]

Why not a 20v head?

 

aside from aftermarket cams (pricey :P ) it should do as a good base. Lets face it, theyre designed to rev, a good port/polish will clean up the airflow and they are nowhere near as old as a bigport.

 

that said, the only values that could be wrong is the power. Toqure is a big selling piont on the gze (lol thats why i bought one!) and anything that gains over stock is a bounus. How bout playing with the timing next?

[ancullen]

Don't really want a 20v head mainly because of the added costs. Cams are 20% more, you need 20% more valves & springs. The only real advantage is that they're already a shim-under bucket design, although I may have found a cheap way of converting a 16v to shim-unders using factory bits. :P

[Biggo]

lol you sound like me trying to save every penny making it go faster. Me old man is always berating me for doin everything on the cheap. Anyway, what the secret to goiin 16v shim underbuckets? Theres a guide on toymods isnt there? and its coaslty....

[ancullen]

Don't know about ToyMods, but Club4AG has an article on using 1SZ-FE (1.0L 4-cylinder from Vitz) under-bucket shims. Supposedly these will go in without much hassel, and are available in a large range of thicknesses. The only issue is that the 1SZ-FE isn't available in any Australian models, so we'd have to get some in from overseas.

 

Whilst I am interested in saving money, the main reason I'm not going 20v is everyone seems to do it. To get the power I want, I don't need to go for a 20v head, so why bother?

[ancullen]

Thanks to Nick I will soon have some replacement cam covers (mine spray oil through intercooler mounting holes) and some bigport cams!!! According to Desktop Dyno2000, that should be enough to get me 188hp @ 7,000rpm (vs. 171 standard) and 158lb/ft @ 4,000rpm (vs. 154@4,500 standard). :P

[ancullen]

Intercooler will very soon be on the way: My Replacement 4A-GZE Intercooler

[ancullen]

Coming soon: Bigport cams & cam covers, ABV mod, dyno tune. Considering the 0.6mm metal head gasket too. Will probably setup a water intercooler spray with the windscreen wiper jets too. Won't be using them on the windscreen anyway as I wash it before I go racing.

Edited September 10, 2006 by ancullen

[ancullen]

Have discovered a 0.7mm copper head gasket on eBay. If I win this auction I'll end up with 9.4:1 compression (at least I'm pretty certain it'll be about that). Which is the same as the bigport 4A-GE, so people will think (when I've got 9.4:1 compression, bigport cams, and bigport cam covers) that I'm an idiot that's attached a 4A-GZE blower setup to a standard bigport 4A-GE. :D

[ancullen]

Have sourced a pair of second-hand Skyline GTR turbos. Will be selling one to a mate (we're going halves). Even though I'd be limited to only 14psi, I think it'd be plenty. A group of guys in Kiwi-land calling themselves Garage Dori built themselves a 4A-GTE and got it up to 182.2kW at the rear wheels!!! See dyno chart here. That's a bigport 4A-GZE converted to turbo with a Megasquirt and Bluetop computer with 8.0:1 compression and running 14psi. Surely my Microtech would be able to do the same job (if not better) as the Megasquirt? At one point before fitting the Megasquirt, they had increased the compression from 8.0:1 to 9.2:1, still running 14psi (see dyno here). So I don't think having 9.4:1 compression and 14psi will be too much of an issue with the added benefits of my later model engine. 300+hp (at the flywheel) here I come. :D

Edited September 11, 2006 by ancullen