blackdak318

Posting this here because I know the most educated C5 dudes hang here.

Putting a N/A 440" LS7 into my C5. It made 595 RWHP in the previous C5 it was in. Trying to figure out what to do for fueling.

Fuel related parts I have so far:
60# LS2 Injectors from A&A Kit
LS3 Fuel Rail
FAST 102 (LS7 Port)

Trying to figure out what to do for proper fueling to make sure I don't have issues when tuning or driving. Leaning towards the Racetronix 255J kit with hotwire harness.

Few questions I have though:
1) Isn't the stock pump a Walbro 255? If so how is the Racetronix 255J different than the stock 255? They say with the hotwire kit the racetronix will support about 600 RWHP. This is exactly where I plan on being. Could I just add the hotwire kit to the stock 255 to achieve my needs?

2) Will the 255J and hotwire kit be enough to safely support 600 RWHP on 93 octane on a N/A motor? My tuner is telling me any 255 will not be enough and I should try and find a 340. Does anyone else make a plug and play kit that has a bigger than 255 pump? The Racetronix kit looks great because from what I have researched it is the most cost effective and easiest to install. I obviously don't want to purchase and install something that won't be enough for my needs though.

C5 Pete

I have the Walbro 255 intank with a racetronics hotwire kit and Boostapump.

I have an NA 14.5:1cr 427 in my race car on E85, and it's somewhere around 750+hp at the crank.

My fuel pressure and AFR is rock solid according to my logs. Idc is 75% at 7500rpm.

I'm using 85lb FIC injectors with the Holley fuel rails that come with the Hi Ram.

Good luck with your new build!

HardcoreABN

a single walbro 450 in the tank will be all you need. I don't trust BAPs for **** after having one almost cost me an engine. I do suggest converting to a return style fuel system though.

blackdak318

Thanks. Your set up sounds much nastier than mine so I think I'm going to pull the trigger on the racetronix set up as it should meet my needs. I can always add a BAP to my set up if needed, however hoping to avoid one as they seem to occasionally have issues as noted above.

I would love to do a single 340 but I don't think anyone makes a plug and play solution to install them in the C5 tank/bucket. I'll be honest in saying I have absolutely no experience working with fuel systems so I will not mess with trying to get a non plug and play pump to work by making custom parts or modifying things. The C5 fuel system seems a lot more complicated than most and I don't want issues. Looking for a plug and play option to meet my fuel needs only. I'm getting more confident that the racetronix pump and hotwire kit will get me there. Just wanted some reassurance from the good people here.

C5 Pete

Oh yeah... GO HUSKERS!!!

js23881

To be honest I ran a built LSX 440 that dynoed 580 RWHP NA and my 255 L Lignefelter pump did fine. Never had fuel supply problems with 60 lb injectors. I did a 400 shot on top of that with SAFE fuel system that also worked great. Just make sure you have a fuel return line included in your system and good fuel regulator set at 55-60 psi.

TTBlueZ06

Single Walbro 450 in the tank.. Done.

blackdak318

I have no plans to add a return fuel line or mess with the regulator. If I absolutely have to I will, but would prefer to leave as is.

What is involved in getting the single Walbro 450 to work? Keep in mind I have absolutely zero fuel system experience other than swapping injectors. I also don't have the tools to custom fab anything.

C5 Pete

I don't believe you'd need a return style with what you're trying to do. What you have going on is not really that exotic.

Keep it simple.

blackdak318

Agree 100%. I'm pretty confident at this point after more research that the Racetronix pump with hotwire upgrade will meet my needs.

I'm still interested in what the single Walbro 450 would take though.

PEETYZ

LPE 255 In tank with Hotwire kit and 60lb injectors should be just fine.

I have that plus a BAP and Bigger injectors and support 715rwhp. I'm also interested in more in tank options but they are limited.

BLOWNBLUEZ06@RKT Performance

I've been building double and triple 450 setups in these tanks for a while now. Something that I do on my customer's cars. I might be about to put a system together to ship out for a forum member here. Two 450's flow as much as the biggest electric powered Magnafuel pump available.

blackdak318

You should post up pictures, install requirements, and prices. Is that something you only provide to your customers or would you be willing to make it available as a one off purchase deal?

Thanks for the input from everyone else. I'm going to go with the Racetronix pump (same as lingenfelter I believe) and hotwire kit.

PEETYZ

I wouldn't mind hearing more about it

BLWN1

Any pricing or details for a bottom mount c5 triple? E85?

blackdak318

Just to follow up on this for anyone who has my same questions in the future. I did go with the Racetronix 255 in tank with their hot wire kit.

On E 85 the car made 540 rwhp on a very stingy local mustang dyno. No issues with fueling whatsoever. Injectors (60#) were at 82% duty cycle. The hot wire kit and pump install were extremely easy. We had it all done in about an hour. Would highly recommend for anyone else exactly like me who needs more fuel and does not want to mess with some expensive kit or a custom deal. This is a decent upgrade, I would consider it cheap, and it was an easy install.

stevieturbo

On E85, there is no way a single 255 is a safe or sensible solution for the power levels you are talking about....although of course they can vary dyno to dyno etc.

Even on pump fuel, that would be towards the upper ends of it's ability.

A single 450 would be overkill for either pump or E85, but also very safe.

blackdak318

Not sure what to tell you but a few of us have done it with no issue.

I would have loved to do a single 450 but no one makes a plug and play kit that I'm aware of. I did not want to have to modify the stock bucket or other parts to make that work.

stevieturbo

Again that comes back to what you believe from dynos and the huge variations between them.

In the UK/Europe, a Walbro 255 is regarded as a 500hp ( dyno, not wheel ) pump on normal gasoline type fuel. A bit more on a n/a build I would think at lower pressures.

Always better to have a safe reserve in the fuel system either way though

hellbents-10

My 2002 C5Z.
Racetronix 255 kit and hotwire kit. 80s on E85 608rwhp NA at 65% IDC.