Search found 30 matches

by matt dunn
Thu Feb 22, 2018 2:57 am
Forum: TECH: Corolla AE86
Topic: rear tire skipping under hard braking
Replies: 22
Views: 1641

Re: rear tire skipping under hard braking

CloudStrife wrote:
Do you mean the nut that holds everything together at the top?

Because it is a pain to torque down proper. I stripped the threads on one side.


Yes that is the one.
by matt dunn
Sat Feb 10, 2018 12:53 am
Forum: TECH: Corolla AE86
Topic: AE86 16V - How to set ignition timing...
Replies: 6
Views: 3501

Re: AE86 16V - How to set ignition timing...

The idle contact in the TPS must also be closed to achieve correct timing,
although the CEL will probably flash a switch code if it is not set correctly.
by matt dunn
Sat Feb 10, 2018 12:51 am
Forum: TECH: Corolla AE86
Topic: rear tire skipping under hard braking
Replies: 22
Views: 1641

Re: rear tire skipping under hard braking

I had an issue with the rear skipping under braking in my race car, KE70 so similar setup to AE86. Found the problem a few days later when pulling apart that the top shock mounts were loose, (cant remember why now, but they had been out and put back in by someone else) The harder you braked the wors...
by matt dunn
Sun Dec 03, 2017 2:31 am
Forum: TECH: 4A-GE ENGINE
Topic: 4AGZE Pistons
Replies: 10
Views: 1013

Re: 4AGZE Pistons

I've found that there are a few companies in New Zealand do 4AGE and 4AGZE performance parts. SQ-Engineering and MRPLtd do the 8.9 pistons that I'm after. Will have to weigh up the cost if I can actually get them from Toyota at all anymore. Cheers guys. FWIW in New Zealand they are about the same t...
by matt dunn
Sun Nov 26, 2017 11:49 pm
Forum: TECH: Corolla FWD / MR2
Topic: OST-044: What the "F"?
Replies: 25
Views: 4661

Re: OST-044: What the "F"?

The MRP rods are also slightly longer than the standard 7A rod aren't they?
about 0.5mm from memory.
by matt dunn
Fri Jan 13, 2017 8:53 pm
Forum: TECH: 4A-GE ENGINE
Topic: Blacktop Link G4+ ECU
Replies: 12
Views: 2300

Re: Blacktop Link G4+ ECU

For dealing with detonation I solely rely on the skill of my tuner. I don't tune my own car, I take it to a professional tuner to get done on a dyno with good detonation listening equipment, and leave it at that.
And then make sure the fuel I use comes from a good source.
by matt dunn
Fri Jan 13, 2017 5:08 pm
Forum: TECH: 4A-GE ENGINE
Topic: Blacktop Link G4+ ECU
Replies: 12
Views: 2300

Re: Blacktop Link G4+ ECU

I just run a simple vvt on at 1500 rpm and off again above xxx rpm.
On the dyno you can find the best vvt switch off point for your setup, probably 6k to 7k rpm somewhere.

I am not a road car so we have not spent much on driveability.
by matt dunn
Fri Jan 13, 2017 2:59 am
Forum: TECH: 4A-GE ENGINE
Topic: Blacktop Link G4+ ECU
Replies: 12
Views: 2300

Re: Blacktop Link G4+ ECU

I have had pretty much all the different versions of the Link ECU's on my 20V race car over the years. I have a Link G4+ Storm in it now. I have never had an issue with the standard 20V dist signals to the ECU, and have also wired up quite a few other 20V link ECU and have not had trigger issues wit...
by matt dunn
Mon Dec 05, 2016 1:55 am
Forum: TECH: 4A-GE ENGINE
Topic: I have a 4age frankenstein and its driving me crazy
Replies: 35
Views: 4864

Re: I have a 4age frankenstein and its driving me crazy

jondee86 wrote:
Since the ECU won't go into diagnostic mode unless the IDL switch is closed,

Cheers... jondee86


It will go into diagnostic mode, just the base timing will be incorrect.
by matt dunn
Sun Dec 04, 2016 10:23 pm
Forum: TECH: 4A-GE ENGINE
Topic: I have a 4age frankenstein and its driving me crazy
Replies: 35
Views: 4864

Re: I have a 4age frankenstein and its driving me crazy

jondee86 wrote:does the advance change when the IDL switch closes ?? Like, if at 900rpm you move the TPS ever so slightly so that the
switch changes state, does the timing jump up or down ??

Cheers... jondee86


Yes it does change when the IDL switch switches.
by matt dunn
Sun Dec 04, 2016 2:23 am
Forum: TECH: 4A-GE ENGINE
Topic: I have a 4age frankenstein and its driving me crazy
Replies: 35
Views: 4864

Re: I have a 4age frankenstein and its driving me crazy

The TPS does matter, especially with the diagnosti connector bridged. The connector must be bridged AND the TPS contact closed before you can set the timing or it will bounce around as the ecu is not correctly in base timing mode. The number of times I have seen cars with the timing incorrect becaus...
by matt dunn
Thu Nov 17, 2016 11:51 pm
Forum: TECH: Corolla AE86
Topic: ID this wiring harness please...
Replies: 3
Views: 690

Re: ID this wiring harness please...

The part at the top which looks like two wires heatshinked together,

That is the A/C evaporator temperature sensor and goes into the AC box to control the temp so it does not freeze.

So the rest of it is probably all AC stuff too.
by matt dunn
Thu Nov 17, 2016 11:43 pm
Forum: TECH: 4A-GE ENGINE
Topic: T3 crank pulley alignment, 20v st
Replies: 8
Views: 1553

Re: T3 crank pulley alignment, 20v st

I take it that you also realise that the Blacktop 20V ones are different to everything else too.

From memory the BT 20V cambelt drive pulley is wider and the crank pulley is narrower,
so a mismatch of the wrong cambelt drive pulley will also put the alternator belts etc out of alignment.
by matt dunn
Wed Oct 19, 2016 2:52 am
Forum: TECH: 4A-GE ENGINE
Topic: 4AGE 20V Adjustable cam timing with VVT
Replies: 12
Views: 3765

Re: 4AGE 20V Adjustable cam timing with VVT

yeah understand that, but didn't think that a few degrees of cam movement would make that difference, The VVT can show the gain in the low range, as the timing could be up to 25 deg difference between VVT and no VVT, but VVT turns off again at high RPM, 6200 or something, so the difference between V...
by matt dunn
Wed Oct 19, 2016 1:47 am
Forum: TECH: 4A-GE ENGINE
Topic: 4AGE 20V Adjustable cam timing with VVT
Replies: 12
Views: 3765

Re: 4AGE 20V Adjustable cam timing with VVT

Was back at the dyno last week with the new build. When we originally built the engine years ago, we ran with the cam timing retarded. When you use the 7A block you lift the head up 17mm and so the cambelt pulls the camwheels about 1/2 tooth retarded. We ran it this way for few years and it made goo...
by matt dunn
Mon Oct 03, 2016 4:17 am
Forum: TECH: 4A-GE ENGINE
Topic: 4AGE 20V Adjustable cam timing with VVT
Replies: 12
Views: 3765

Re: 4AGE 20V Adjustable cam timing with VVT

From what I remember when I looked into when playing around with bits,
the 5 degree difference in the ST and BT cam timing is in the cam.
Swapping from a BT VVT camwheel to a ST VVT camwheel did not change the actual cam timing at all.
by matt dunn
Fri Sep 30, 2016 12:39 am
Forum: TECH: Corolla FWD / MR2
Topic: 4agze cas...how to tell if its bad or not?
Replies: 4
Views: 1415

Re: 4agze cas...how to tell if its bad or not?

Measuring the resistance of the internal sensors would be a good start.
by matt dunn
Fri Sep 30, 2016 12:26 am
Forum: TECH: 4A-GE ENGINE
Topic: 4AGE 20V Adjustable cam timing with VVT
Replies: 12
Views: 3765

Re: 4AGE 20V Adjustable cam timing with VVT

Good point,? I dont think there is a feed and return oil hole, just one feed that either has pressure applied or is vented and has no pressure. From memory lookimg into the cam wheel there was one hole for the locator dowell, but dont remember seeing where/how the oil gets into the mechanism. I will...
by matt dunn
Mon Sep 26, 2016 4:00 am
Forum: TECH: 4A-GE ENGINE
Topic: 4AGE 20V Adjustable cam timing with VVT
Replies: 12
Views: 3765

4AGE 20V Adjustable cam timing with VVT

So you can get aftermarket adjustable cam wheels for the 4AGE 20V, I know TODA and a few other make them, I had a set in the previous engine build, but they all do away with VVT, which is a big downside. I have been thinking about trying to make the factory VVT cam wheel adjustable. It only goes ont...
by matt dunn
Fri Aug 26, 2016 2:33 am
Forum: TECH: Corolla AE86
Topic: Flywheel bolts... the lowdown...
Replies: 21
Views: 4499

Re: Flywheel bolts... the lowdown...

I have had an experience with broken flywheel bolts on the 7A. http://i16.photobucket.com/albums/b20/MattDunn20V/7AGTE/FLB%202_zpszwxx8yqm.jpg I do believe there is quite a high chance that they were not tightened correctly though. Cannot remember if they were used, new genuine or new ARP. They let ...
by matt dunn
Wed May 11, 2016 4:17 am
Forum: TECH: Corolla FWD / MR2
Topic: help with timing
Replies: 3
Views: 1072

Re: help with timing

I have struck this before a couple of times, usually only on cars where the engine has been transplanted. I have found incorrect wiring which end up with power on the start feed wire to the ecu. I think from memory it is the STA wire in the ECU. This should only be powered while cranking as when the...
by matt dunn
Wed Mar 23, 2016 3:26 am
Forum: TECH: 4A-GE ENGINE
Topic: 4AGZE on engine stand
Replies: 5
Views: 1377

Re: 4AGZE on engine stand

I had a set of spacers and bolts made for mine so I can put it on the stand with the flywheel on and still turn it.
Couldn't find the right things off the shelf.
by matt dunn
Wed Mar 23, 2016 3:23 am
Forum: TECH: 4A-GE ENGINE
Topic: crank sensor bracket
Replies: 7
Views: 2271

Re: crank sensor bracket

It's a VR sensor, not hall effect, but yes. '96 and later OBD2 4A and 7A engines use this. Do you know what the internals of the pump are like? Do they have the same width gears as the late model good 4AGE pumps? as the sensor on the crankshaft like that is much more accurate than the CAS/dist off ...
by matt dunn
Sat Feb 13, 2016 12:42 am
Forum: TECH: 4A-GE ENGINE
Topic: 20V 4A-GE ST - Starting issue
Replies: 32
Views: 4071

Re: 20V 4A-GE ST - Starting issue

I have found that if you need to constantly pump the throttle to keep a car going it is a fuel pressure problem. Pull the return line off not the feed line and put a hose on it into a bucket or container. If you don't get a decent amount of fuel out of the hose while cranking then you don't have eno...
by matt dunn
Sun Oct 11, 2015 4:14 am
Forum: TECH: Corolla AE86
Topic: 4AGE arp head studs issue?
Replies: 15
Views: 3843

Re: 4AGE arp head studs issue?

There has to be something else going on that hasn't been accounted for. Unless you just happened to get that one in a hundred thousand kits that didn't get heat treated or was improperly done or something like that. I also find it oddly suspicious when one shop has repeated issues that no one else ...
by matt dunn
Sun Sep 13, 2015 1:24 am
Forum: TECH: 4A-GE ENGINE
Topic: timing belt wont tension - 7rib -
Replies: 4
Views: 748

Re: timing belt wont tension - 7rib -

I thought hydraulic tensioners were only used on the Blacktop 20V engines ?
The Blacktop uses a different belt to the Silvertop as the tensioner wheel is in a different location.
That may be why you are a tooth out in the belt,
as the Silvertop 20V has the same tensioner setup as all the 16v's.
by matt dunn
Sun Sep 13, 2015 1:12 am
Forum: TECH: Corolla AE86
Topic: 4AGE arp head studs issue?
Replies: 15
Views: 3843

Re: 4AGE arp head studs issue?

allencr wrote:Same torque & technique & ARP goop?
Thanks.


Yes both done with appropriate technique and lube.

My dyno tuner has seen it before on 4AG based stuff,
and they ended up going to 13mm ARP headstuds ( to suit Mitsi EVO's apparantly)
to fix the issue.
by matt dunn
Sun Aug 30, 2015 3:07 am
Forum: TECH: 4A-GE ENGINE
Topic: 4age Silvertop 20v stalls
Replies: 11
Views: 1548

Re: 4age Silvertop 20v stalls

If is runs fine with no AFM,
and wont with it plugged in
then most likely cause is faulty AFM.

Have struck that on a couple of 20V's now.
by matt dunn
Sun Aug 30, 2015 2:40 am
Forum: TECH: Corolla AE86
Topic: 4AGE arp head studs issue?
Replies: 15
Views: 3843

Re: 4AGE arp head studs issue?

I'm not sure where the stock head bolts give, 200whp? 300-400whp? My setup may be a bit different as I run 7A bottom end on a 20V with a Turbo, but I have just ditched the ARP studs and gone back to new genuine toyota studs. We found that at about 500hp the ARP studs would let the head lift and it ...
by matt dunn
Fri Jun 26, 2015 4:19 am
Forum: TECH: ZN6, ZC6 (FR-S,BRZ,86)
Topic: AE101 to GT86 Conversion
Replies: 3
Views: 2931

AE101 to GT86 Conversion

A few years back we built a couple of AE101 Levin race cars, we converted them to RWD with a 2JZGTE and sequential box etc. One was used for circuit racing, and the other was built for endurance races here in NZ, 3, 4, 6 and 12 hr races. Unfortunatly the circuit racing one was destroyed in a massive...

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