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Search: Posts Made By: Brettus
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10-19-2018, 11:51 PM
Replies: 42
Views: 1,038
Posted By Brettus

Just did .... Seems that guy didn't fully...

Just did .... Seems that guy didn't fully understand how it worked ;)
10-19-2018, 11:27 PM
Replies: 42
Views: 1,038
Posted By Brettus

RX7 pump Compare with pic on first page (of the...

RX7 pump
Compare with pic on first page (of the linked thread) ...design is the same :
...
10-19-2018, 10:55 PM
Replies: 42
Views: 1,038
Posted By Brettus

Not true : ...

Not true :
https://www.rx8club.com/series-i-tech-garage-22/omp-oil-metering-pump-output-modification-268559/
10-19-2018, 05:42 PM
Replies: 1,759
Views: 152,837
Posted By Brettus

Thanks to some tips from jcbrx8 I'm finally able...

Thanks to some tips from jcbrx8 I'm finally able to overlay logs from the AEM failsafe .
The log below shows :
boost press - light blue
Pressure at turbo- dark blue
Pressure at turbine - red
I...
10-14-2018, 05:14 PM
Replies: 22
Views: 456
Posted By Brettus

But ................ it does ! I've tuned maybe a...

But ................ it does ! I've tuned maybe a dozen cars with the AEM intake . All of them needed the maf rescaled to avoid fuel trims that caused them to run too rich under load.
10-12-2018, 04:59 PM
Replies: 22
Views: 456
Posted By Brettus

The AEM intake could have something to do with...

The AEM intake could have something to do with the low mpg as they don't register the same g/s as a stock intake . That LTFT will be mostly from the AEM ...IMO .
What is ltft when you are cruising...
10-12-2018, 12:24 PM
Replies: 51
Views: 1,154
Posted By Brettus

Yes ... it could just be the positioning of the...

Yes ... it could just be the positioning of the sensor which commonly causes a limp mode to occur .
10-11-2018, 04:54 PM
Replies: 51
Views: 1,154
Posted By Brettus

The small pump major diameter is 2.5mm and the...

The small pump major diameter is 2.5mm and the large one is 5.4mm .Maximum stroke is 1.5mm.
The drive shaft for the omp rotates once for every two revs of the engine .
The small pump rotates once...
10-11-2018, 04:03 AM
Replies: 25
Views: 667
Posted By Brettus

Ethanol content ?

Ethanol content ?
10-09-2018, 01:19 PM
Replies: 67
Views: 2,207
Posted By Brettus

I like to deactivate the VDI altogether . It's an...

I like to deactivate the VDI altogether . It's an NA valve only and with FI it tends to just create a power drop as it opens but has no other effect - positive or negative.
The APV valve activation...
Forum: RX-8 Racing
10-03-2018, 02:11 PM
Replies: 121
Views: 4,800
Posted By Brettus

Unless you have somehow seriously messed up your...

Unless you have somehow seriously messed up your setup ...you wont have air anywhere.
09-30-2018, 03:10 PM
Replies: 67
Views: 2,207
Posted By Brettus

Impressed with your systematic approach to the...

Impressed with your systematic approach to the task . Looking good !
09-30-2018, 02:20 PM
Replies: 8
Views: 380
Posted By Brettus

Because that turbo doesn't come with that turbine...

Because that turbo doesn't come with that turbine ...it comes with a 63mm turbine only. The number 71 stands for 71mm INducer compressor and 63 stands for 63mm INducer turbine. Other turbos use...
09-29-2018, 03:20 PM
Replies: 8
Views: 380
Posted By Brettus

Also : you need to choose a turbine that matches...

Also : you need to choose a turbine that matches your chosen turbo .... The 70mm0.92 is wrong for the 7163. I think you will find that backpressures will be quite high once you rehash pressure losses...
09-28-2018, 10:27 PM
Replies: 8
Views: 380
Posted By Brettus

Here are numbers from my current setup that match...

Here are numbers from my current setup that match very well to what I see in reality .
...
09-26-2018, 12:50 AM
Replies: 1,759
Views: 152,837
Posted By Brettus

I would go with a twin scroll (T3 if you can) and...

I would go with a twin scroll (T3 if you can) and run 11/2" runners to the turbo from each end , siamese to wastegate and a small diameter balance tube from each outer runner also going to wastegate...
09-24-2018, 05:52 PM
Replies: 1,759
Views: 152,837
Posted By Brettus

I just replace my flexible intake with a solid...

I just replace my flexible intake with a solid one and seeing some good results for turbine backpressure .
Back pressure at 14psi with flexi intake :...
09-13-2018, 11:29 PM
Replies: 1,759
Views: 152,837
Posted By Brettus

So .......... had another crack on the dyno today...

So .......... had another crack on the dyno today . Red line is today's run , blue line is from march . Both were at 14.5psi so I could see if there is any major improvement . As you can see ,...
09-09-2018, 07:04 PM
Replies: 1,759
Views: 152,837
Posted By Brettus

This is a log at 6psi tapering to 7psi for last...

This is a log at 6psi tapering to 7psi for last 1000rpm . 313whp @ 7800 . Would probably make another 20 or so if taken out to 8500.
...
09-08-2018, 10:10 PM
Replies: 1,759
Views: 152,837
Posted By Brettus

Boost was jumping around at over 7000 but is now...

Boost was jumping around at over 7000 but is now very stable everywhere . Pretty happy with this

Logs indicating :
@7psi - 300whp (minimum boost possible at 7500rpm)
@10psi - 350whp
@13.5psi...
08-27-2018, 12:15 AM
Replies: 8
Views: 271
Posted By Brettus

75psi sounds very low but it depends on cranking...

75psi sounds very low but it depends on cranking speed .

https://cimg3.ibsrv.net/gimg/www.rx8club.com-vbulletin/990x800/80-compression_chart_330e12fac3f10e9c0c66a011698ff3bad7c572c5.png
08-26-2018, 10:00 PM
Replies: 8
Views: 271
Posted By Brettus

If the seals on the side of your rotors are worn...

If the seals on the side of your rotors are worn , gas can leak passed them from the combustion chamber . If this was happening it is likely your compression will be low also .
08-16-2018, 03:23 PM
Replies: 1,759
Views: 152,837
Posted By Brettus

Update : went to dyno yesterday . We took it up...

Update : went to dyno yesterday . We took it up to 14psi and 400whp and could see no improvement over my previous attempt plus it seemed to be dropping away earlier in the rpm range so we called it a...
08-12-2018, 09:51 PM
Replies: 1,759
Views: 152,837
Posted By Brettus

Dyno booked for Thursday ...................

Dyno booked for Thursday ...................
07-26-2018, 03:41 PM
Replies: 1,759
Views: 152,837
Posted By Brettus

10 psi log ....pretty much the same as earlier...

10 psi log ....pretty much the same as earlier setups . Full power comes on a little earlier maybe....
07-24-2018, 03:11 PM
Replies: 2,298
Views: 120,259
Posted By Brettus

Solid mount ? That can't be pleasant ! Good...

Solid mount ? That can't be pleasant !

Good to see you are still around Slash!
07-24-2018, 03:09 PM
Replies: 1,759
Views: 152,837
Posted By Brettus

:) Here's me thinking hardly anyone was...

:) Here's me thinking hardly anyone was interested!

Did some tuning yesterday dialing in some bigger injectors.Will post a 10psi log soon . Also trying to get hold of a weld flange so we can make...
07-17-2018, 03:31 PM
Replies: 1,759
Views: 152,837
Posted By Brettus

The whole object of the exercise is to make the...

The whole object of the exercise is to make the Renesis work better with a turbo. Not because I think it will be any better than an REW or a hybrid, but because ... it's hard to do and no-one has...
07-16-2018, 03:10 AM
Replies: 13
Views: 441
Posted By Brettus

just don't premix at all ........

just don't premix at all ........
07-15-2018, 03:55 PM
Replies: 1,759
Views: 152,837
Posted By Brettus

Just came back from holiday . New engine is built...

Just came back from holiday . New engine is built ...picking it up today. Will be taking my time putting it in and getting it ready for one last ditch attempt at the world record whp for a Renesis. ...
07-14-2018, 09:59 PM
Replies: 15
Views: 2,004
Posted By Brettus

The issue with the gear maps is that you don't...

The issue with the gear maps is that you don't know which table will be used (without testing) and it can swap between tables without you changing gear as JB mentioned . To overcome this is pretty...
06-23-2018, 06:04 PM
Replies: 14
Views: 3,392
Posted By Brettus

The afr tables are not per gear as Steve pointed...

The afr tables are not per gear as Steve pointed out ...however , what table is used does jump around at high rpm in the higher gears . It's for this reason I adopted the 'make all the tables the...
06-21-2018, 11:07 PM
Replies: 1,759
Views: 152,837
Posted By Brettus

Seems I'm not done with experimenting . Got some...

Seems I'm not done with experimenting . Got some new ideas in the pipeline for another crack at this . Getting another engine built .

Maybe this one will be ..................... IT !
06-11-2018, 09:13 PM
Replies: 1,173
Views: 205,234
Posted By Brettus

Jimmy .... I don't think Arctic is turboed ...so...

Jimmy .... I don't think Arctic is turboed ...so he will want to aim for around 12.5 , not 11.2 .
05-29-2018, 12:23 AM
Replies: 22
Views: 561
Posted By Brettus

Stage 1 : read the section on power upgrades ...

Stage 1 : read the section on power upgrades
Stage 2 : realise you are SOL
Stage 3 : sell rx8 and buy a car with power
05-22-2018, 11:06 PM
Replies: 5
Views: 413
Posted By Brettus

This is symptomatic of a failing fuel...

This is symptomatic of a failing fuel pump/blocked fuel filter . How many kms on the fuel pump ? They typically should be replaced every 100,000kms
Replies: 100
Views: 48,805
Posted By Brettus

Only real concern is that it's a waste of money,...

Only real concern is that it's a waste of money, time and effort ........................ IMO
05-09-2018, 03:31 PM
Replies: 41
Views: 4,055
Posted By Brettus

Would be very interested to know what indicaters...

Would be very interested to know what indicaters you were following to know to stop at 408 whp . You have plenty of fuel and turbo so why didn't you try for more ?
05-08-2018, 03:23 PM
Replies: 16
Views: 1,212
Posted By Brettus

Am I lazy for not following you on instagram or...

Am I lazy for not following you on instagram or are you lazy for not posting information here? Actually I didn't even know what you meant by 'IG' till today ..lol



That's exactly what I have...
04-23-2018, 01:25 AM
Replies: 25
Views: 1,268
Posted By Brettus

yeah ....it's really horrible having to wait 0.5...

yeah ....it's really horrible having to wait 0.5 seconds to get double the torque :Freak_ani
04-12-2018, 03:28 PM
Replies: 1,759
Views: 152,837
Posted By Brettus

jcbrx8 .... I'm pretty sure 9krpm didn't mean to...

jcbrx8 .... I'm pretty sure 9krpm didn't mean to say E85 and 93 "on the same tune" .

But with what I do and recommend you can run on the same tune .

I do my tune for E28 (1 part E10 to 3 parts...
04-11-2018, 07:40 PM
Replies: 335
Views: 56,190
Posted By Brettus

Got a letter for each of my 8s the other day ....

Got a letter for each of my 8s the other day . TBH I'm more concerned about the lower arm issue than the air bag one ... I've seen what happens when those let go !
04-10-2018, 07:47 PM
Replies: 1,759
Views: 152,837
Posted By Brettus

Great question ! What I'm experiencing only...

Great question ! What I'm experiencing only manifests itself at elevated mass flows and the dropoff in power/psi is sudden and dramatic . I said way back at my first dyno that it was like hitting the...
04-09-2018, 07:32 PM
Replies: 26
Views: 833
Posted By Brettus

I saw something very similar on a race car last...

I saw something very similar on a race car last week . It wouldn't rev past 7500 in 4th gear but was fine everywhere else . I logged it and found the throttle was opening and closing by itself ! The...
04-06-2018, 11:25 PM
Replies: 1,759
Views: 152,837
Posted By Brettus

Yes any porting of the siamese ports makes it...

Yes any porting of the siamese ports makes it worse , making them smaller ...helps.
I have tried a tighter fitting sleeve (professionally inconel welded) ... it beat itself to death and I ended up...
04-05-2018, 11:13 PM
Replies: 1,759
Views: 152,837
Posted By Brettus

That's the correction for temp and atmospheric...

That's the correction for temp and atmospheric pressure .
04-05-2018, 04:53 PM
Replies: 1,759
Views: 152,837
Posted By Brettus

Ok - so I hit the dyno again yesterday ......

Ok - so I hit the dyno again yesterday ... different dyno again . Result ...pretty much the same . Please ignore the torque figure , it relates to dyno drum torque not engine torque . Actual torque...
03-30-2018, 03:55 PM
Replies: 1,759
Views: 152,837
Posted By Brettus

I have tried that in the past ...but no , not at...

I have tried that in the past ...but no , not at the moment . I just reset the SSV table to have it open at 4000 . Which does help the turbo to spool up a little quicker and avoids the hesitations...
03-30-2018, 03:42 PM
Replies: 1,759
Views: 152,837
Posted By Brettus

It's around 420g/s(56lbs/min) from the maf...

It's around 420g/s(56lbs/min) from the maf readings ,but hard to know how accurate those are. It seems to line up pretty well with the Matchbot calculations.
03-27-2018, 10:03 PM
Replies: 90
Views: 3,372
Posted By Brettus

couldn't tell you that ...I just know from...

couldn't tell you that ...I just know from injector pulse width logs that some fuel is still injected when engine braking for the Renesis....

See this log showing a full throttle power run follow...
Showing results 1 to 50 of 132
 


 
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