Injectors

[chrismacc]

Hi there, first of all my names Christopher and in no way am I a mechanic (actually a surgeon from costa rica) so you can guess my knowledge here is practically null. The advantage is I have a very good mechanic he was even trained in the states working on monster trucks or what not.
So heres the deal, I have a 4.0 renix thats busted, bought a 4.2 and am using the cranckshaft and conecting rods from the 4.2.

Doing all the rest of the engine and buying the parts, I came up with a question....my injectors. I upgraded to the bosch 0280155746 which made a huuuuuuge diference, but have no idea if these work for my new stroker projec.

I'd really appreciate any help on the matter, just remember I really have no idea how a motor works the newest of the newbies understands more than me hahahahahaha, thank you very much!

***searched around and couldnt find any usefull info around the forum trying not to spam

[Cheromaniac]

I'll assume that you have an '87-'90 XJ with a stock Renix ECU and 39psi fuel system.
Here's a small list of Bosch injectors to choose from:

Bosch 0280155712 19.4lb/hr @ 43.5psi
Bosch 0280155703 22.7lb/hr @ 43.5psi
Bosch 0280155715 23.7lb/hr @ 43.5psi
Bosch 0280155849 24.5lb/hr @ 43.5psi (same as Ford XF1E-A5B)
Bosch 0280155784 26.3lb/hr @ 43.5psi

Since it looks like you're just building a mild Renix stroker, I think the 703 injectors will be suitable for your needs.

[chrismacc]

That's what im dealing with , you got it!!!

Thank you very very much, injectors ordered, now just waiting for all the parts to arrive, you've helped me a lot!!!

[MWManess]

ive heard on upgrading the tank pump for the 24lb injectors, does anyone know which pump will go in as an upgrade?

[Cheromaniac]

The stock 90lph fuel pump will do fine.

[chrismacc]

Hi there , well it's done stroked 4.0! But I'm not very sure with the dyno Im getting all the juice out of it.

It peaked at 114 hp with around 194 ft/lb.

[chrismacc]

IMG-20211119-WA0117.jpg

[Randy Bobandi]

How big are the tires??

[Cheromaniac]

Hi there , well it's done stroked 4.0! But I'm not very sure with the dyno Im getting all the juice out of it.

It peaked at 114 hp with around 194 ft/lb.

Those are low numbers but there could be a number of factors at play. Big heavy tires being the biggest one.
Can you post the full dyno graph to get a clearer picture of what's going on?

[chrismacc]

Sorry, never noticed the answers. I dont hace the complete dyno info, and its on 39's...so yeah heavy tires

[Hellfrekke80]

Hi there, first of all my names Christopher and in no way am I a mechanic (actually a surgeon from costa rica) so you can guess my knowledge here is practically null. The advantage is I have a very good mechanic he was even trained in the states working on monster trucks or what not.
So heres the deal, I have a 4.0 renix thats busted, bought a 4.2 and am using the cranckshaft and conecting rods from the 4.2.

Doing all the rest of the engine and buying the parts, I came up with a question....my injectors. I upgraded to the bosch 0280155746 which made a huuuuuuge diference, but have no idea if these work for my new stroker projec.

I'd really appreciate any help on the matter, just remember I really have no idea how a motor works the newest of the newbies understands more than me hahahahahaha, thank you very much!

***searched around and couldnt find any usefull info around the forum trying not to spam

I've heard about upgrading the tank pump for the 24lb injectors. Does anyone know which pump would be a suitable upgrade?

[Cheromaniac]

You don't need to upgrade the stock fuel pump to run 24lb injectors.