hx35-461HP--is this OK??

[NOMIEZVR4]

So we just started cranking up the boost on my brothers 98 GSX. Its got 6 bolt eagle/wiseco bottom end, Fully ported 2g head with +1mm valves and upgraded valvetrain port matched 1g IM and ported 2g exhaust manifold with HKS 264/272 cams.

The setup for the most part consists of:
HX35 w/BEP housing externally gated
Full 3" exhaust
FIC 1250 running e85
walbro 255 rewired
TRE stage 3 trans

Its got all the bolt-ons..FMIC, DSMlink Lite, etc..Pressure tested to 30lbs last week. No leaks, tight intake tract.

-45 Global correction and 735 deadtime on link for e85

Last nite we were out tuning on e85. Started out with zero timing adjustment on DSMlink and began tuning at 20ish lbs of boost. First we got the AFR's solid in the 11.9-12.1 range. Then we cranked up the boost going from 21lbs initially to spiking to 36lbs but only being able to hold 25-26lbs till redline(more on this in a minute). Then I slowly added timing into the mix, getting up to about 8 degrees advance till the 8k redline. Max horsepower according to DSMlink was 460hp that was with 3 people in the car weighing in at 150lbs each(3rd gear pulls) Does the HP seem OK? I'm sure with 1 person in the car the numbers may jump up 20-25hp?

I'm thinking the spring in the Tial 38mm needs more tension so were gonna crack open the WG and see what spring we have and double it up so we can at least hold 30lbs of boost till redline. Hoping to achieve over 500whp at that point..comments? Am I missing anything?? Your input would greatly be appreciated.

Also curious to see what kind of timing advance you guys are running with DSMlink...I know sometimes with e85 its tough to see knock so with each degree of timing advance I was checking to see if we were still making more power with each pull.
Thanks

 

[EclipseOwner95]

1. I've never trusted any horsepower numbers from ECMLink

2. I'd be a little concerned with that single walbro, it's bound to be near it's limits at that kind of power, even the injectors are on the small side.

I'm making around 550 at the wheels with dual walbro's and 2150's seeing 60-65% DC.

3. I wouldn't recommend thrashing your car riding 4 deep, although you do have a built trans, still not worth the extra load.


4. AFR looks reasonable, I would shoot for more timing, I'm currently running 12.2-12.3 AFR and 17* of peak timing on an HTA86 @ 34psi. I'm also on a stock block, I'd definitely turn up the wick with a forged bottom end.

 

[NOMIEZVR4]

Thanks for the input. The car was just recently given life so I'm not going for broke yet just trying to make sure its doing what its supposed to do. I have VD software so I"ll try plugging the numbers into that and seeing what happens.

The walbro 255 will likely need to be replaced with a wally 400. How much further can this single walbro take me?

Trust me, I don't like riding 3 deep especially when doing so many pulls, but they're my brothers... I'll make an attempt not to put so much weight in the car next time.

18 degrees advance!! Wow. I'm sure I could easily pick up another 30-50hp from more timing alone.

Keep the comments coming, thanks!!

 

[EclipseOwner95]

Thanks for the input. The car was just recently given life so I'm not going for broke yet just trying to make sure its doing what its supposed to do. I have VD software so I"ll try plugging the numbers into that and seeing what happens.

The walbro 255 will likely need to be replaced with a wally 400. How much further can this single walbro take me?

Trust me, I don't like riding 3 deep especially when doing so many pulls, but they're my brothers... I'll make an attempt not to put so much weight in the car next time.

18 degrees advance!! Wow. I'm sure I could easily pick up another 30-50hp from more timing alone.

Keep the comments coming, thanks!!

Personally I think that 500whp on E85 with a single walbro is like knocking on deaths door, others may disagree, but especially running a lot of boost/fuel pressure, the flow really tapers off.

 

[NOMIEZVR4]

Hmm...that upgrade may need to happen a lot sooner than I was expecting. I don't want to take any risks like that.

How can I tell how many lbs/min I'm flowing at a certain boost level??

 

[EclipseOwner95]

Hmm...that upgrade may need to happen a lot sooner than I was expecting. I don't want to take any risks like that.

How can I tell how many lbs/min I'm flowing at a certain boost level??

DSMLink logs airflow as gram/s by default, you can change the settings to lb/min.

Given your MAF table is accurate it should give you a decent idea of what kind of air you're moving.

I made roughly 9whp per lb/min I saw when I was on the dyno.

 

[NOMIEZVR4]

I'll need to look at the logs and check IDC's and air flow numbers it seems. Thanks a lot man!!

With an upgraded pump, realistically how much whp is my setup good for??

 

[My1GLaser]

Post a log of a 3rd gear pull!!! I'm flowing 54-55 lb/min on an HX35 at 33 psi right now. 60% E-85. 1150s at 80% IDC. Base FP at 38 psi. My fuel system is about maxxed. I have a Kenne Bell Boost-A-Pump which helps.

I am getting 21* timing and about 12:1 AFR. Here is one of mine from the other day for comparison. I did just switch to the BEP .70 A/R BEP housing cause the .55 A/R was choking me out up top at 38 psi.

 

[habitatguy187]

It's hard to tell really, but on e85 and 70ish psi fuel pressure is kinda scary. I have a drop in 340 for sale in the classifieds

 

[GSXDNA]

If you don't want to spring for a new pump right away, another potential option is to go with a 50/50 E85/pump mix. I've had great results with that so far on my HX40 setup. Running 30psi and 18* peak timing on a stock bottom end with one 255 wally and 1100's. I like the 50/50 mix because if you start pushing it way too hard, it will eventually knock a bit, whereas in my last setup at 100% E85 i would never see any knock no matter how stupid I got.

 

[NOMIEZVR4]

I can't see the log, what program do I need to view that file? I will definitely post a log of one of the few pulls that we did.

I wont take any chances, I'm gonna order up a walbro 400 before I make any other changes.

Hey that's great advice GSXDNA, I've read that the mazdaspeed guys have had a lot of success doing a 50/50 mix. Usually when you DO see knock with e85, its too late unfortunately...

Keep the advice coming, lots of GREAT info in here...

 

[EclipseOwner95]

Post a log of a 3rd gear pull!!! I'm flowing 54-55 lb/min on an HX35 at 33 psi right now. 60% E-85. 1150s at 80% IDC. Base FP at 38 psi. My fuel system is about maxxed. I have a Kenne Bell Boost-A-Pump which helps.

I am getting 21* timing and about 12:1 AFR. Here is one of mine from the other day for comparison. I did just switch to the BEP .70 A/R BEP housing cause the .55 A/R was choking me out up top at 38 psi.

Just taking a quick gander at your log. Why are you using the timing sliders instead of the DA table?


And you just open the log with DSMLink application. Also, I replied to your PM.

 

[GSXDNA]

Hey that's great advice GSXDNA, I've read that the mazdaspeed guys have had a lot of success doing a 50/50 mix. Usually when you DO see knock with e85, its too late unfortunately...

Yeah, I really haven't found much downside to the 50/50 mix yet. Besides seeing knock earlier and putting less stress on your fuel system, you also get better fuel economy which saves you some coin. If you're trying to push the setup to the absolute limits, then the 50/50 might not be for you, but otherwise it's a good option.

 

[My1GLaser]

I haven't gotten around to using the DA tables for timing yet. I just switched to them for AFR a couple months ago and I've had V3 for years I get the timing that I want, so I might not bother...

I run a blended mix cause I have to drive 100 miles one way to get it! I haven't had of the black goo issue either and I've been running this for 3 years.

 

[EclipseOwner95]

I haven't gotten around to using the DA tables for timing yet. I just switched to them for AFR a couple months ago and I've had V3 for years I get the timing that I want, so I might not bother...

I run a blended mix cause I have to drive 100 miles one way to get it!

Hehe, I hear yah, It took me a while to finally take the plunge and stop using the sliders. I had V2 when it was new and that's all I had to work with for a long time.

If it gets you where you need to be that's all that matters really.

 

[joat09]

If you don't want to spring for a new pump right away, another potential option is to go with a 50/50 E85/pump mix. I've had great results with that so far on my HX40 setup. Running 30psi and 18* peak timing on a stock bottom end with one 255 wally and 1100's. I like the 50/50 mix because if you start pushing it way too hard, it will eventually knock a bit, whereas in my last setup at 100% E85 i would never see any knock no matter how stupid I got.

Isnt no knock a good thing?

 

[EclipseOwner95]

Isnt no knock a good thing?

Yes, but using E85 you can get really crazy and still have no pre-ignition, doesn't mean you're not running lean, or running too much timing advance to do damage.


Here are two 2nd-4th gear pulls in my car.

 

[boost97gst]

great thread. What kind of correction are you using on youre global scaler with 50/50? Ive been thinging of not making any correction with a 25% e85 mix and seeing how that holds up. Ive added a gallon before and the only noticeable difference was less knock and a higher combined ft% idleing and cruising. I dont care much about that though.

 

[My1GLaser]

What turbo are you running EclipseOwner95?

 

[bastarddsm]

What exhaust side are you running? 461 only hold 25psi is about where I'd expect it.

I didn't see how much advance you are running but if you thikn 18* is high you much be low. I see 23-24 at 35spsi on mine, and thats where it makes best power.

 

[GSTurbo1]

I wouldn't imagine that an ECU would give correct HP readings. It's based on calculations that can have some kind of error

 

[EclipseOwner95]

What turbo are you running EclipseOwner95?

I'm running a bolt on HTA86.

And yeah, the OP is running 8* of advance at redline. I consider my 17* to be quite conservative hehe.

 

[efrainz28]

I would like to see what the VE are. The 2g head was matched ported to a 1g IM. Not trying to start a 1g vs 2g cylinder head debate but would like to see the affects of porting the 2g head to 1g size.

 

[genegoesfast]

I'm running 19* advance at 12:1 on e85 & hx35 at 25 psi and I'm logging around 440hp so I think your variables my not be quite right. You definitely can't lean on link for perfect dyno numbers but it is a nice way to compare.

 

[white92talontsi]

Try running 2-3* at peak and then ramp up to 15 to start off with and you will see a big difference.

And to the guy makin 550 with 2 walbros and 2150's seeing 60-65% IDC. there may be something wrong with your setup. Are you running the stock lines? You probably need more pump though.