hotwire or gems...whats gonna be best?

[Seight-V8]

hiya all,

just got of the phone with chris at RPI, and now i have some thinking to be done.

Chris has said why run the GEMS when hotwire could be just as good but cheaper????

I already run hotwire on my present 3.5...but will be moving up to 4.6 soon, so would have all the bits i need.

I also have all the bits to run the gems on the 4.6, although this route might be more expensive.

I have ruled out aftermarket ECU's as i dont know enough about mapping to be able to go this route...although it might be cheaper.

So which one hotwire or GEMS will make the best option.

The reason i like the gems, is its fully mapped and has no dizzy, and after talking to mark adams, hes says this is the best sytem to use...

so anyone offer there 10pence worth before i make some purchases?

cheers

scott

[katanaman]

Whatever you use your going to need to get it mapped so if your willing to pay Adams to map a GEMS system why not someone to map an aftermarket system?
Personally I dont see how hotwire could even be better than GEMS. You can argue about the benefits of sequential injection but its no contest over the fact it has ignition. Trouble with GEMS is its a pita to get going outside where its meant to be.

[r2d2hp]

If I had not picked up an Emerald ECU cheap then for sure I was going the GEM's route as I bought all the parts but never got round to buying the 2 chips from him to be able to get it to work.

If you want a really good setup and have the £700 to spare which after all you would not buy you a decent ECU aftermarket ECU then go for it.

After Mark setup my Hotwire it drove fantastic, no complaints at all.

Don't let people put you off saying the AFM is a restriction as I dont believe it, if Mark says it will do the job then you can be assured it will.

[Seight-V8]

hello all,

Been taking to ray at V8D yesterday about my block and the GEMS.

He recommends that the GEMS might not be best suited to going in a westfield as the lamba sensors wont be able to change the fueling fast enough as the car will accelerate quite fast due to its weight.

He has suggested the the hotwire setup might be better.

Although i wanted to run my engine without a dizzy.

So could i convert all the GEMS sensors and coil pack to run say megasquirt, this is the route i really didnt want to take, but might be a more viable option, not only due to cost but in performance too.

I need to decide what engine management i will be using before i go too far with the block build, as i dont want to disassembling later on.


the more i talk to people the more i keep changing my mind....lol

thanks for any input.

scott

[Eliot]

He recommends that the GEMS might not be best suited to going in a westfield as the lamba sensors wont be able to change the fueling fast enough as the car will accelerate quite fast due to its weight.
scott

I dont understand that statement. The base map should be accurate enough to get the desired AFR at any load point Without having to rely on the lambdas. They are not there to correct a poor map. I assume the gems lambda's are narrowband (how many wires are coming out of them?) - which means they are only going to target the perfect 14.7 afr, which isn't actually best power.

[Seight-V8]

eliot,

According to the rover p38 manual the lambas are

titanium (sor must be wideband i presume)

des hamill book says they should read ratios 16.5 - 11.0

And they have 4 wires coming from them, 2 for heat, 2 for ecu i presume.

I am not looking for peak power, but dont want to be wasting my money either if you know what i mean.

cheers

scott

[Teesdale_landrover]

i'd go for a 14cux with suitable chip

buy the time you have messed about plumbing a fully mappable ecu in, getting it mapped to the standard of a mark adams chip and buying the ecu its gonna be 3 times the price

[Eliot]

And they have 4 wires coming from them, 2 for heat, 2 for ecu i presume.
scott

Narrowband all day long.