0opticZ06

kromberg

How does the 310-intank pump compare to the Racetronix one?

Keith

R6_C5_CLS55

310 is made by Bosch and pumps 310 LPH

Racetronix is 255 LPH and is made by Walbro.

I have heard that the longevity of the Bosch is superior, but I have not had any problems with my Racetronix yet. Other than that, I don't know if any differences. Anyone else want to chime in?

Shinobi'sZ

Puttin her to the test this weekend at A&A Corvette.

Just for reference, when my car was @ Xtreme, the BAP was turned all the way to 0. That means no BAP. So with the LPE Fuel Pump and the MDMC fuel return system (retrofit) my fuel pressure went to 70pis and then dropped to 64psi over the last 2000 rpms.

For comparison purposes, when I had my TTi Stage III system I only had the LPE Pump (no BAP which is the same as the BAP turned off). I did not have the MDMC return system. My fuel pressure would go to 64psi and drop to 54psi over the last 2000 rpms. The addition of just the MDMC system (return, regulator, etc..) allowed for an additional 6psi in Fuel Pressure and held 64psi with no BAP.

This weekend at Andy's we will be running a 16-17lbs boost run...the BAP will be turned all the way up this time. So it will definetly put the LPE 255lph pump to its limits and will put the overall fuel system to the test. I will say now that I will consider it a success if 60psi or over can be maintained with max boost at max rpm.

0opticZ06

After we "waxed" our third 255 pump we went with the Bosch 310 we have had no problems from there on out. At this point with the in-tank Bosch 310 and the return system we have achieved 1012 RWHP with 15 psi and in two weeks we will go for broke.

Cheers
MDMC
OpticZ

Brian Tooley C5

It's nice to see innovative stuff like that displayed, great job!!

0opticZ06

kumar75150

hmmmm if i decide to go turbo, looks like i know who to call about a fuel system

VETZILLA

Boost referenced return system = only way to go on big hp

Very nice setup

Shinobi'sZ

This dyno graph was produced using the MDMC fuel system (Return & Regulator only..not the pump) and NO Boost Reference.

Not saying I don't like boost reference. I just don't have enough pump to support 1:1 boost reference. Asking the pump to pump more than it is designed makes the pump less efficient.

My FP was a solid 62psi at the rail from start to finish on this run.

I also just recently found out I had 3 broken spark plug wires during these tuning session. I am more suspicious that the broken spark plug wires were causing some misfires between 4000-6500rpms vs what I previously thought (spark plugs). But I won't be able to tell for sure if it was plugs or wires now because I have replaced both the plugs and the wires.

dads01dream

Man! That's one powerful car!!!!

I went to MDMC's website, but could not find any pricing or add'l info about their kit..... Could you fill us in?

Shinobi'sZ

dads,
I believe I was the first person Sean let have pieces of the MDMC kit, parted out. I needed a return system and just happened to ask one day what he had going on with his cars, and he was kind enough to share. I asked him if he would be willing to sell his return setup, since he had already tested it out and it was successful..and to my surprise he said OK.

I think he was a little hesitant to keep doing it, because others purchased the pieces and then were calling not knowing how to install them. I think it was time consuming for him to be trying to walk DIYer through the install process. At some point in time I remember him wanting to only sell to shops or experienced DIYers.

I think he sold the pieces to me at a discounted price since I was trying it out on my TT. I don't know what he sells all the pieces for these days. I think it would be best just to give him a call and ask him. I know that it worked for me.

dads01dream

Thanks for the info! I'll touch base with MDMC as my needs increase. Fantastic vette you're got there!!

Shinobi'sZ

kromberg

How sells this Bosch 310 LPH pump and it is compatiable with the C5 sending unit? Can the just the pump be swapped out for a Racetronix pump?

Keith

Racetronix

The Bosch pump is not compatible with the factory jet pump system.

b98

kromberg

Come again. Will it not connect/fit with the factory sending unit hardware?

Keith

glennd

Below is an email I sent to Sean in May. The fuel system was installled as recommended. I changed over from a late model 2003 Z06 system to MDMC's recommended return System. I was running out of fuel at 630HP. With the new MDMC system and The Kenne Bell Bap it ran out 30HP sooner than stock pump did with the BAP. Attached is correspondence sent to Sean back in May. He never responded. If you look at the fuel flow of the Bosch Pump he suplied you will see that it is not an upgradeat all. It does not support horse power numbers much greater than 600HP with 60# injector on a supercharged engine . Beware!!!
(Hi Sean: I received in my 40 amp Kenne Bell boost-a-pump. I now realize, that when they specify 50% voltage increase, that refers to a car that is only putting out about 11.5 Volts. In other words the Kenne Bell boost-a-pump will only put out 17.5 volts max. Are you using a MSD controller that can put out 22 Volts? My experience here is that the Bosch Pump does not put out quite as high flow as did the stock pump did at the same 17.5 volts. I looked up a Bosch 0 580 254 979 pump and it is rated at 165 liters / hr @ 75 PSI. I am not being successful with this setup. What do you think I might be doing wrong?
Best Regards Glenn)

kromberg

Hmmmmm.... the Racetronix pump is crappier than a stock pump?!?!?!!

Keith